Re: Redirect all mail from one domain to the same u...@otherdomain?
Mouss wrote: Jeff Weinberger a �crit : [snip] This is helpful, but I still need the query to take all the other alias domains into account. So, I need the IF condition, or a second map. I don't think so. I used this. I don't remember the details, but the idea is that you can often get rid of flow control (if, ...) using additional tables. Thanks - yes, additional tables, maps, etc. would make the sql coding far simpler. Thank you for your help...it's informative as always! if the wildcard alias will produce the result I need then this is resolved. @example.org @example.com works, but smtpd will accept mail to anyth...@... (virtual_alias_maps are used for recipient validation during the smtp transaction). if all addresses are valid (catchall or whatver), this is ok. otherwise, it's bad. in any case, you must make sure that mail isn't bounced after it is accepted (queued). This is what happens by default (after virtual alias expansion, a delivery error occurs, and an NDR is generated). Thank you - this will work well. I'll use a catchall mailbox to make sure that I don't generate an NDR. thanks for your help!
Re: Redirect all mail from one domain to the same u...@otherdomain?
Jeff Weinberger a écrit : [snip] This is helpful, but I still need the query to take all the other alias domains into account. So, I need the IF condition, or a second map. I don't think so. I used this. I don't remember the details, but the idea is that you can often get rid of flow control (if, ...) using additional tables. Thank you for your help...it's informative as always! if the wildcard alias will produce the result I need then this is resolved. @example.org@example.com works, but smtpd will accept mail to anyth...@example.org (virtual_alias_maps are used for recipient validation during the smtp transaction). if all addresses are valid (catchall or whatver), this is ok. otherwise, it's bad. in any case, you must make sure that mail isn't bounced after it is accepted (queued). This is what happens by default (after virtual alias expansion, a delivery error occurs, and an NDR is generated).
Re: Redirect all mail from one domain to the same u...@otherdomain?
jeff_homeip a écrit :
[snip]
that creates some complications...and might be too difficult
a script and a Makefile... or sql as below:
but why not use wildcard virtual aliases? You noted below that they break
recipient
validations. Do you mean that smtp_recipient_restrictions won't work? at all
or parts?
no, it's not about smtpd restrictions. it's about rejecting mail to
invalid recipients.
Wildcard virtual aliases seems like the best waybut I want to understand
the implications
on everything esle before I proceed.
Thanks!
The reason is that if you use
@example.com @example.org
then this breaks recipient validation: smtpd will accept
anything^example.com, then at delivery time, the user won't be found and
a bounce will be generated. in short, you become a source of backscatter
(you send bounces to innocents whose addresses were forged by spammers)
Unless I don't bounce unknown addresses
and you'd do what with these? if you have a catchall, it's ok. but you
should not discard mail (people do mistype addresses some time, so it's
not just spammers trying invalid addresses).
you can generate the individual mappings with a script. alternatively,
if you store users in sql, you can use sql statements to generate these
on the fly. examples have been posted multiple times to the list (a
long time ago, that said, but you may be lucky...).
it would be something like:
if (%d='domain1.com') then select %...@domain2..com from virtual_alias else
select alias
from virtual_alias where address=%s
(that's not quite right in the syntax, but you get the idea). This wont'
work, as I'd have to
write a special select clause for each domain I want to work this way.
assuming you have a User table containing valid email addresses and a
AliasDomain table containing (alias, destination) domains:
select User.user from AliasDomain, User where
AliasDomain.alias = '%d'
AND
User.user = CONCAT('%u', '@', AliasDomain.destination)
you can avoid the CONCAT inside the search if you split your emails in
(user, domain) columns like I do. in which case, the query becomes
select CONCAT(User.user, '@', User.domain) where
AliasDomain.alias = '%d'
AND
AliasDomain.destination = User.domain
AND
User.user = '%u'
of course, this works for 1 depth alias domains (it doesn't work if
example.net is an alis for example.org which is in turn an alias of
example.com). but this should be enough in most cases.
Re: Redirect all mail from one domain to the same u...@otherdomain?
jeff_homeip a écrit :
[snip]
that creates some complications...and might be too difficult
a script and a Makefile... or sql as below:
but why not use wildcard virtual aliases? You noted below that they
break
recipient
validations. Do you mean that smtp_recipient_restrictions won't
work? at all
or parts?
no, it's not about smtpd restrictions. it's about rejecting mail to
invalid recipients.
Wildcard virtual aliases seems like the best waybut I want to
understand
the implications
on everything esle before I proceed.
Thanks!
The reason is that if you use
@example.com @example.org
then this breaks recipient validation: smtpd will accept
anything^example.com, then at delivery time, the user won't be
found and
a bounce will be generated. in short, you become a source of
backscatter
(you send bounces to innocents whose addresses were forged by
spammers)
Unless I don't bounce unknown addresses
and you'd do what with these? if you have a catchall, it's ok. but you
should not discard mail (people do mistype addresses some time, so
it's
not just spammers trying invalid addresses).
I use a catchall for some domains instead of rejecting unknown
recipients, for exactly that reason. I find about 2-3% of catchall mai
is user errors (like mis-spellings) rather than spam.
So in this case, I can use a wildcard catchall.
So an alias map of:
@domain1.tld @domain2.tld
will produce the expected result of anyuser @ domain1.tld being
redirected to the same user (anyuser) @ domain2.tld?
That would be by far the easiest to do in my setup.
you can generate the individual mappings with a script.
alternatively,
if you store users in sql, you can use sql statements to generate
these
on the fly. examples have been posted multiple times to the list
(a
long time ago, that said, but you may be lucky...).
it would be something like:
if (%d=3D'domain1.com') then select %...@domain2..com from
virtual_alias else select alias
from virtual_alias where address=3D%s
(that's not quite right in the syntax, but you get the idea). This
wont' work, as I'd have to
write a special select clause for each domain I want to work this
way.
assuming you have a User table containing valid email addresses and a
AliasDomain table containing (alias, destination) domains:
select User.user from AliasDomain, User where
AliasDomain.alias =3D '%d'
AND
User.user =3D CONCAT('%u', '@', AliasDomain.destination)
you can avoid the CONCAT inside the search if you split your
emails in
(user, domain) columns like I do. in which case, the query becomes
select CONCAT(User.user, '@', User.domain) where
AliasDomain.alias =3D '%d'
AND
AliasDomain.destination =3D User.domain
AND
User.user =3D '%u'
of course, this works for 1 depth alias domains (it doesn't work if
example.net is an alis for example.org which is in turn an alias of
example.com). but this should be enough in most cases.
This is helpful, but I still need the query to take all the other
alias domains into account. So, I need the IF condition, or a second
map.
Thank you for your help...it's informative as always!
if the wildcard alias will produce the result I need then this is
resolved.
--
Jeff Weinberger
http://disruptivemarketing.jeffweinberger.com
Re: Redirect all mail from one domain to the same u...@otherdomain?
--- In postfix-us...@yahoogroups.com, Victor Duchovni
victor.ducho...@... wrote:
On Sun, Feb 08, 2009 at 09:50:16PM -0800, Jeff Weinberger wrote:
I am trying to figure out the best way to map one domain to
another with
the same users...precisely the behavior I am trying to achieve is:
when
mail is sent (from outside, or from another user within my postfix
installation) to u...@... I want it redirected to u...@...
- in otherwords, the user is preserved, but the domain is
translated/rewritten. To be more specific:
us...@... gets re-routed to us...@...
us...@... gets re-routed to us...@...
- Are you looking to rewrite just the envelope recipient, or also
message
From/To/Cc headers?
It's only important to rewrite the envelope sender. The result I want
is that the message is delivered to *...@domain2.tld - if it has the
original To/Cc header that's fine, and probably desireable.
- Is all mail first passed through an SMTP content_filter?
Yes. All mail coming from outside my server is passed through
amavisd-new for spam/virus checking. Mail originating from my server
is passed through a specialized content filter. (via the submission
service)
It is important that this rewrite apply to messages coming from
outside as well as those originating on my server.
- Are all the original and rewritten recipients delivered to another
host
via SMTP, or is some of the mail delivered locally (local,
virtual, ...)?
I'm not completely sure this answers your question, but the message
may be only to u...@domain1.tld or to a number of addresses including
u...@domain1.tld. Only the copy of the message to u...@domain1.tld
should get rerouted to u...@domain2.tld.
both domain1.tld and domain2.tld are mine and my postfix instance is
the MX for them. domain1.tld is an alias domain and domain2.tld is a
virtual domain.
My initial guess is to use recipient_canonical_maps and use a pcre
map:
/^(.*)@domain1.tld/ {$1)@domain2.tld
This guess is wrong for many reasons, but I think it best to first
understand what problem you are really trying to solve, before we
tear apart the wrong answer to potentially the wrong question.
Thank you...but I would also like to know if I can impose on your
time, what is wrong with this - it will help me better solve this and
future problems.
I don't see a way to achieve this with alias_maps and
header_checks (with
action REDIRECT) would miss messages sent to u...@... where that is
not the To: or Cc: address (such as list mail).
This is worse.
That I understood. Thanks.
Really, I am just checking with experts more knowledgeable than I
whether I
have chosen a good (or the best) way to achieve this, or if there
is a
better way.
Yes, there is a correct way of solving your problem, but first describe
your problem in more detail.
Does that help? Please let me know if there is any more detail I can
provide.
Thank you for your help!
--
Viktor.
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Please do not ignore the Reply-To header.
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Re: Redirect all mail from one domain to the same u...@otherdomain?
jeff_homeip a écrit :
--- In postfix-us...@yahoogroups.com, Victor Duchovni
victor.ducho...@... wrote:
On Sun, Feb 08, 2009 at 09:50:16PM -0800, Jeff Weinberger wrote:
I am trying to figure out the best way to map one domain to
another with
the same users...precisely the behavior I am trying to achieve is:
when
mail is sent (from outside, or from another user within my postfix
installation) to u...@... I want it redirected to u...@...
- in otherwords, the user is preserved, but the domain is
translated/rewritten. To be more specific:
us...@... gets re-routed to us...@...
us...@... gets re-routed to us...@...
- Are you looking to rewrite just the envelope recipient, or also
message
From/To/Cc headers?
It's only important to rewrite the envelope sender.
you mean the envelope recipient. if so, use virtual_alias_maps. however,
don't use wildcard virtual aliases. instead, generate one mapping for
each user:
us...@example.com us...@example.org
...
The reason is that if you use
@example.com@example.org
then this breaks recipient validation: smtpd will accept
anything^example.com, then at delivery time, the user won't be found and
a bounce will be generated. in short, you become a source of backscatter
(you send bounces to innocents whose addresses were forged by spammers)
you can generate the individual mappings with a script. alternatively,
if you store users in sql, you can use sql statements to generate these
on the fly. examples have been posted multiple times to the list (a
long time ago, that said, but you may be lucky...).
The result I want
is that the message is delivered to *...@domain2.tld - if it has the
original To/Cc header that's fine, and probably desireable.
so you want virtual_alias_maps (yes, these apply to _all_ domains. don't
confuse with virtual_alias_domains).
- Is all mail first passed through an SMTP content_filter?
Yes. All mail coming from outside my server is passed through
amavisd-new for spam/virus checking. Mail originating from my server
is passed through a specialized content filter. (via the submission
service)
you must disable rewrite except in one smtpd in a chain. see the FILTER
README (look for no_address_mappings) or amavisd-new README.postfix.
if you don't, then virtual aliases will be expanded twice (before and
after the filter), which may result in duplicate mail (think of a foo
- foo, bar, which becomes foo - foo, foo, bar if expanded twice).
It is important that this rewrite apply to messages coming from
outside as well as those originating on my server.
virtual_alias_maps apply to all mail.
- Are all the original and rewritten recipients delivered to another
host
via SMTP, or is some of the mail delivered locally (local,
virtual, ...)?
I'm not completely sure this answers your question, but the message
may be only to u...@domain1.tld or to a number of addresses including
u...@domain1.tld. Only the copy of the message to u...@domain1.tld
should get rerouted to u...@domain2.tld.
both domain1.tld and domain2.tld are mine and my postfix instance is
the MX for them. domain1.tld is an alias domain and domain2.tld is a
virtual domain.
My initial guess is to use recipient_canonical_maps and use a pcre
map:
/^(.*)@domain1.tld/ {$1)@domain2.tld
This guess is wrong for many reasons, but I think it best to first
understand what problem you are really trying to solve, before we
tear apart the wrong answer to potentially the wrong question.
Thank you...but I would also like to know if I can impose on your
time, what is wrong with this - it will help me better solve this and
future problems.
see above. wildcard virtual aliases and canonical break recipient
validations.
[snip]
Re: Redirect all mail from one domain to the same u...@otherdomain?
--- In post...@yahoogroups.com, mouss mo...@... wrote:
jeff_homeip a écrit :
--- In postfix-us...@yahoogroups.com, Victor Duchovni
Victor.Duchovni@ wrote:
On Sun, Feb 08, 2009 at 09:50:16PM -0800, Jeff Weinberger wrote:
I am trying to figure out the best way to map one domain to
another with
the same users...precisely the behavior I am trying to achieve is:
when
mail is sent (from outside, or from another user within my postfix
installation) to user@ I want it redirected to user@
- in otherwords, the user is preserved, but the domain is
translated/rewritten. To be more specific:
user1@ gets re-routed to user1@
user2@ gets re-routed to user2@
- Are you looking to rewrite just the envelope recipient, or also
message
From/To/Cc headers?
It's only important to rewrite the envelope sender.
you mean the envelope recipient.
yes, sorry, my typo.
if so, use virtual_alias_maps. however,
don't use wildcard virtual aliases. instead, generate one mapping for
each user:
us...@... us...@...
...
that creates some complications...and might be too difficult
but why not use wildcard virtual aliases? You noted below that they break
recipient
validations. Do you mean that smtp_recipient_restrictions won't work? at all or
parts?
Wildcard virtual aliases seems like the best waybut I want to understand
the implications
on everything esle before I proceed.
Thanks!
The reason is that if you use
@example.com @example.org
then this breaks recipient validation: smtpd will accept
anything^example.com, then at delivery time, the user won't be found and
a bounce will be generated. in short, you become a source of backscatter
(you send bounces to innocents whose addresses were forged by spammers)
Unless I don't bounce unknown addresses
you can generate the individual mappings with a script. alternatively,
if you store users in sql, you can use sql statements to generate these
on the fly. examples have been posted multiple times to the list (a
long time ago, that said, but you may be lucky...).
it would be something like:
if (%d='domain1.com') then select %...@domain2..com from virtual_alias else
select alias
from virtual_alias where address=%s
(that's not quite right in the syntax, but you get the idea). This wont' work,
as I'd have to
write a special select clause for each domain I want to work this way.
The result I want
is that the message is delivered to *...@domain2.tld - if it has the
original To/Cc header that's fine, and probably desireable.
so you want virtual_alias_maps (yes, these apply to _all_ domains. don't
confuse with virtual_alias_domains).
- Is all mail first passed through an SMTP content_filter?
Yes. All mail coming from outside my server is passed through
amavisd-new for spam/virus checking. Mail originating from my server
is passed through a specialized content filter. (via the submission
service)
you must disable rewrite except in one smtpd in a chain. see the FILTER
README (look for no_address_mappings) or amavisd-new README.postfix.
if you don't, then virtual aliases will be expanded twice (before and
after the filter), which may result in duplicate mail (think of a foo
- foo, bar, which becomes foo - foo, foo, bar if expanded twice).
I already do that..thanks
It is important that this rewrite apply to messages coming from
outside as well as those originating on my server.
virtual_alias_maps apply to all mail.
- Are all the original and rewritten recipients delivered to another
host
via SMTP, or is some of the mail delivered locally (local,
virtual, ...)?
I'm not completely sure this answers your question, but the message
may be only to u...@... or to a number of addresses including
u...@... Only the copy of the message to u...@...
should get rerouted to u...@...
both domain1.tld and domain2.tld are mine and my postfix instance is
the MX for them. domain1.tld is an alias domain and domain2.tld is a
virtual domain.
My initial guess is to use recipient_canonical_maps and use a pcre
map:
/^(.*)@domain1.tld/ {$1)@domain2.tld
This guess is wrong for many reasons, but I think it best to first
understand what problem you are really trying to solve, before we
tear apart the wrong answer to potentially the wrong question.
Thank you...but I would also like to know if I can impose on your
time, what is wrong with this - it will help me better solve this and
future problems.
see above. wildcard virtual aliases and canonical break recipient
validations.
[snip]
Redirect all mail from one domain to the same u...@otherdomain?
Hi:
I would appreciate any advice anyone can offer on how best to achieve
this behavior:
I am trying to figure out the best way to map one domain to another
with the same users...precisely the behavior I am trying to achieve
is: when mail is sent (from outside, or from another user within my
postfix installation) to u...@domain1.tld I want it redirected to u...@domain2.tld
- in otherwords, the user is preserved, but the domain is translated/
rewritten. To be more specific:
us...@domain1.tld gets re-routed to us...@domain2.tld
us...@domain1.tld gets re-routed to us...@domain2.tld
and so on.
My initial guess is to use recipient_canonical_maps and use a pcre map:
/^(.*)@domain1.tld/ {$1)@domain2.tld
I don't see a way to achieve this with alias_maps and header_checks
(with action REDIRECT) would miss messages sent to u...@domain1.tld
where that is not the To: or Cc: address (such as list mail).
Really, I am just checking with experts more knowledgeable than I
whether I have chosen a good (or the best) way to achieve this, or if
there is a better way.
Any advice and help are much appreciated!
Thanks,
--Jeff
--
Jeff Weinberger
http://disruptivemarketing.jeffweinberger.com
Re: Redirect all mail from one domain to the same u...@otherdomain?
On Sun, Feb 08, 2009 at 09:50:16PM -0800, Jeff Weinberger wrote:
I am trying to figure out the best way to map one domain to another with
the same users...precisely the behavior I am trying to achieve is: when
mail is sent (from outside, or from another user within my postfix
installation) to u...@domain1.tld I want it redirected to u...@domain2.tld
- in otherwords, the user is preserved, but the domain is
translated/rewritten. To be more specific:
us...@domain1.tld gets re-routed to us...@domain2.tld
us...@domain1.tld gets re-routed to us...@domain2.tld
- Are you looking to rewrite just the envelope recipient, or also message
From/To/Cc headers?
- Is all mail first passed through an SMTP content_filter?
- Are all the original and rewritten recipients delivered to another host
via SMTP, or is some of the mail delivered locally (local, virtual, ...)?
My initial guess is to use recipient_canonical_maps and use a pcre map:
/^(.*)@domain1.tld/ {$1)@domain2.tld
This guess is wrong for many reasons, but I think it best to first
understand what problem you are really trying to solve, before we
tear apart the wrong answer to potentially the wrong question.
I don't see a way to achieve this with alias_maps and header_checks (with
action REDIRECT) would miss messages sent to u...@domain1.tld where that is
not the To: or Cc: address (such as list mail).
This is worse.
Really, I am just checking with experts more knowledgeable than I whether I
have chosen a good (or the best) way to achieve this, or if there is a
better way.
Yes, there is a correct way of solving your problem, but first describe
your problem in more detail.
--
Viktor.
Disclaimer: off-list followups get on-list replies or get ignored.
Please do not ignore the Reply-To header.
To unsubscribe from the postfix-users list, visit
http://www.postfix.org/lists.html or click the link below:
mailto:majord...@postfix.org?body=unsubscribe%20postfix-users
If my response solves your problem, the best way to thank me is to not
send an it worked, thanks follow-up. If you must respond, please put
It worked, thanks in the Subject so I can delete these quickly.
