[pfx] Re: Fallback server for a migration

[Jérôme BECOT via Postfix-users]

What I did is this:

virtual_mailbox_maps = ldap:/etc/postfix/ldap/virtual_mailbox.cf < gets 
the recipient from mail property
virtual_alias_maps  = ldap:/etc/postfix/ldap/virtual_alias.cf,  
< < gets the recipient from mailalias property
ldap:/etc/postfix/ldap/virtual_mailbox.cf, < gets the alias from mail 
property

hash:/etc/postfix/virtual_alias  < @abc @oldmx

I just use the same ldap config, because I would have either to have the 
same config in another ldap file, or having a script that just do the 
same (build the 1:1 alias file from ldap)


Le 09/06/2023 à 16:09, Wietse Venema via Postfix-users a écrit :

Jerome BECOT via Postfix-users:

Thank you it works fine !

Here is what I did (I'd like your confirmation on the first that I do
not make a mistake):

- added the virtual_mailbox_maps LDAP config to virtual_alias_maps as
well (thus generating $u...@abc.com -> $u...@abc.com alias, letting the
rule match)

I suppose it "works" but I prefer to use features for their intended
purpose. virtual_mailbox_maps is not for aliasing; that is what
virtual_alias_maps is for.

Thus:

virtual_alias_maps =  

Wietse
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[pfx] Re: Fallback server for a migration

[Wietse Venema via Postfix-users]

Jerome BECOT via Postfix-users:
> Thank you it works fine !
> 
> Here is what I did (I'd like your confirmation on the first that I do 
> not make a mistake):
> 
> - added the virtual_mailbox_maps LDAP config to virtual_alias_maps as 
> well (thus generating $u...@abc.com -> $u...@abc.com alias, letting the 
> rule match)

I suppose it "works" but I prefer to use features for their intended
purpose. virtual_mailbox_maps is not for aliasing; that is what
virtual_alias_maps is for.

Thus:

virtual_alias_maps =  

Wietse
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[pfx] Re: Fallback server for a migration

[Jérôme BECOT via Postfix-users]

Thank you it works fine !

Here is what I did (I'd like your confirmation on the first that I do 
not make a mistake):


- added the virtual_mailbox_maps LDAP config to virtual_alias_maps as 
well (thus generating $u...@abc.com -> $u...@abc.com alias, letting the 
rule match)


- let only @abc.com @oldmx.abc.com rule in the virtual_alias file
- added the smtp_recipient_restriction rule

This way:

- Sending a mail to some...@abc.com delivers locally if the mail exists
- Forwards to some...@oldmx.abc.com rewriting recipient back to 
some...@abc.com (smtp_generic_maps)

- Delivers locally on oldmx.abc.com if the mail exists
- Fails on abc.com with Recipient address rejected: User unknown (in 
reply to RCPT TO command) if the mail does not exists on oldmx.abc.com


Regards

Jerome


Le 08/06/2023 à 22:12, Wietse Venema via Postfix-users a écrit :

J?r?me BECOT via Postfix-users:

If I get it, the virtual alias change to another domain then the
smtp_generic_maps change back to the original domain ? It works fine.

I played with it and I'd like something generic because we don't have
knowledge of all remaining adresses on the old mail.

I can set the smtp_generic like this:

@oldmx.abc.com @abc.com

But I can't do the same for the virtual alias (it changes email in all
my local users to oldmx.abc.com and sends directly to the old server).
Is there a solution to map any unknown user without providing emails in
virtual aliases ?

You will have to enumerate (all the the oldmx recipients), or (all
the abc recipients that should not be forwarded to oldmx).

1 - Enumerate virtual aliases for 'oldmx' users, as in my first response.

2 - All of the following: a) Enumerate all the abc users with 1:1
virtual aliases (u...@abc.com  ->u...@abd.com),  b) use one wildcard
virtual alias (@abc.com -> @oldmx.abc.com) that forwards everything
else to oldmx.abc.com, c) use smtp_generic_maps as in my first
response, and d) use reject_unverified_recipient to avoid accepting
non-existent recipients.

Wietse


Thank you

Le 07/06/2023 ? 17:00, Wietse Venema via Postfix-users a ?crit?:

J?r?me BECOT via Postfix-users:

Hello,

I know that this may have been asked a few times, but I need some help:

I manage a server for the domain abc.org. The mx points to my server and
it is configured to:

- lookup virtual mailboxes and virtual aliases from LDAP
- send mails to dovecot

It works, but I'd like to handle recipients that does not exist in LDAP
(nor in Dovecot) and forward them to an older server, that used to own
the domain:

j...@abc.com   > exists in LDAP > delivered to Dovecot
jdaniel > does not exists in LDAP > forwarded to oldmx.abc.com

I have unsuccessfully tried to:

- add a hashed tranport map in virtual_transport_maps
- add it in transport_maps

That would fail with "User Unkonwn" errors.

You need a virtual alias:

/etc/postfix/main.cf:
  virtual_alias_maps = hash:/etc/postfix/virtual_alias

/etc/postfix/virtual_alias
  jdan...@abc.com   usern...@oldmx.abc.com

(or LDAP equivalent).

DO NOT add oldmx.abc.com to main.cf:virtual_alias_domains.

In the case that oldmx.abc.com rejects mail for
usern...@oldmx.abc.com, you also need:

/etc/postfix/main.cf:
  smtp_generic_maps = hash:/etc/postfix/smtp_generic

/etc/postfix/smtp_generic:
  usern...@oldmx.abc.com   usern...@abc.com

(or LDAP equivalent).

Wietse
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[pfx] Re: Fallback server for a migration

[Wietse Venema via Postfix-users]

J?r?me BECOT via Postfix-users:
> If I get it, the virtual alias change to another domain then the 
> smtp_generic_maps change back to the original domain ? It works fine.
> 
> I played with it and I'd like something generic because we don't have 
> knowledge of all remaining adresses on the old mail.
> 
> I can set the smtp_generic like this:
> 
> @oldmx.abc.com @abc.com
> 
> But I can't do the same for the virtual alias (it changes email in all 
> my local users to oldmx.abc.com and sends directly to the old server). 
> Is there a solution to map any unknown user without providing emails in 
> virtual aliases ?

You will have to enumerate (all the the oldmx recipients), or (all
the abc recipients that should not be forwarded to oldmx).

1 - Enumerate virtual aliases for 'oldmx' users, as in my first response.

2 - All of the following: a) Enumerate all the abc users with 1:1
virtual aliases (u...@abc.com -> u...@abd.com),  b) use one wildcard
virtual alias (@abc.com -> @oldmx.abc.com) that forwards everything
else to oldmx.abc.com, c) use smtp_generic_maps as in my first
response, and d) use reject_unverified_recipient to avoid accepting
non-existent recipients.

Wietse

> Thank you
> 
> Le 07/06/2023 ? 17:00, Wietse Venema via Postfix-users a ?crit?:
> > J?r?me BECOT via Postfix-users:
> >> Hello,
> >>
> >> I know that this may have been asked a few times, but I need some help:
> >>
> >> I manage a server for the domain abc.org. The mx points to my server and
> >> it is configured to:
> >>
> >> - lookup virtual mailboxes and virtual aliases from LDAP
> >> - send mails to dovecot
> >>
> >> It works, but I'd like to handle recipients that does not exist in LDAP
> >> (nor in Dovecot) and forward them to an older server, that used to own
> >> the domain:
> >>
> >> j...@abc.com  > exists in LDAP > delivered to Dovecot
> >> jdaniel > does not exists in LDAP > forwarded to oldmx.abc.com
> >>
> >> I have unsuccessfully tried to:
> >>
> >> - add a hashed tranport map in virtual_transport_maps
> >> - add it in transport_maps
> > That would fail with "User Unkonwn" errors.
> >
> > You need a virtual alias:
> >
> > /etc/postfix/main.cf:
> >  virtual_alias_maps = hash:/etc/postfix/virtual_alias
> >
> > /etc/postfix/virtual_alias
> >  jdan...@abc.com  usern...@oldmx.abc.com
> >
> > (or LDAP equivalent).
> >
> > DO NOT add oldmx.abc.com to main.cf:virtual_alias_domains.
> >
> > In the case that oldmx.abc.com rejects mail for
> > usern...@oldmx.abc.com, you also need:
> >
> > /etc/postfix/main.cf:
> >  smtp_generic_maps = hash:/etc/postfix/smtp_generic
> >
> > /etc/postfix/smtp_generic:
> >  usern...@oldmx.abc.com  usern...@abc.com
> >
> > (or LDAP equivalent).
> >
> > Wietse
> > ___
> > Postfix-users mailing list --postfix-users@postfix.org
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> -- 
> *J?r?me BECOT*
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[pfx] Re: Fallback server for a migration

[Jérôme BECOT via Postfix-users]

If I get it, the virtual alias change to another domain then the 
smtp_generic_maps change back to the original domain ? It works fine.


I played with it and I'd like something generic because we don't have 
knowledge of all remaining adresses on the old mail.


I can set the smtp_generic like this:

@oldmx.abc.com @abc.com

But I can't do the same for the virtual alias (it changes email in all 
my local users to oldmx.abc.com and sends directly to the old server). 
Is there a solution to map any unknown user without providing emails in 
virtual aliases ?


Thank you

Le 07/06/2023 à 17:00, Wietse Venema via Postfix-users a écrit :

J?r?me BECOT via Postfix-users:

Hello,

I know that this may have been asked a few times, but I need some help:

I manage a server for the domain abc.org. The mx points to my server and
it is configured to:

- lookup virtual mailboxes and virtual aliases from LDAP
- send mails to dovecot

It works, but I'd like to handle recipients that does not exist in LDAP
(nor in Dovecot) and forward them to an older server, that used to own
the domain:

j...@abc.com  > exists in LDAP > delivered to Dovecot
jdaniel > does not exists in LDAP > forwarded to oldmx.abc.com

I have unsuccessfully tried to:

- add a hashed tranport map in virtual_transport_maps
- add it in transport_maps

That would fail with "User Unkonwn" errors.

You need a virtual alias:

/etc/postfix/main.cf:
 virtual_alias_maps = hash:/etc/postfix/virtual_alias

/etc/postfix/virtual_alias
 jdan...@abc.com  usern...@oldmx.abc.com

(or LDAP equivalent).

DO NOT add oldmx.abc.com to main.cf:virtual_alias_domains.

In the case that oldmx.abc.com rejects mail for
usern...@oldmx.abc.com, you also need:

/etc/postfix/main.cf:
 smtp_generic_maps = hash:/etc/postfix/smtp_generic

/etc/postfix/smtp_generic:
 usern...@oldmx.abc.com  usern...@abc.com

(or LDAP equivalent).

Wietse
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[pfx] Re: Fallback server for a migration

[Wietse Venema via Postfix-users]

J?r?me BECOT via Postfix-users:
> Hello,
> 
> I know that this may have been asked a few times, but I need some help:
> 
> I manage a server for the domain abc.org. The mx points to my server and 
> it is configured to:
> 
> - lookup virtual mailboxes and virtual aliases from LDAP
> - send mails to dovecot
> 
> It works, but I'd like to handle recipients that does not exist in LDAP 
> (nor in Dovecot) and forward them to an older server, that used to own 
> the domain:
> 
> j...@abc.com > exists in LDAP > delivered to Dovecot
> jdaniel > does not exists in LDAP > forwarded to oldmx.abc.com
>
> I have unsuccessfully tried to:
> 
> - add a hashed tranport map in virtual_transport_maps
> - add it in transport_maps

That would fail with "User Unkonwn" errors.

You need a virtual alias:

/etc/postfix/main.cf:
virtual_alias_maps = hash:/etc/postfix/virtual_alias

/etc/postfix/virtual_alias
jdan...@abc.com usern...@oldmx.abc.com

(or LDAP equivalent).

DO NOT add oldmx.abc.com to main.cf:virtual_alias_domains.

In the case that oldmx.abc.com rejects mail for 
usern...@oldmx.abc.com, you also need:

/etc/postfix/main.cf:
smtp_generic_maps = hash:/etc/postfix/smtp_generic

/etc/postfix/smtp_generic:
usern...@oldmx.abc.com usern...@abc.com

(or LDAP equivalent).

Wietse
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