Re: Hide local IP from non delivery notifications

[Claudio Corvino]

Right! I did the setup and it works correctly!

Thanks to all

On 15/02/23 14:34, Daryl Richards wrote:

On 2023-02-15 6:41 a.m., Claudio Corvino wrote:
Ok thanks for your answer but I have another question: if I reject 
the e-mail instead of sending the non delivery notification, how can 
a "good" user be notified of the fact that his e-mail was not delivered?


Claudio


That should be the job of the sender's MTA, not you.



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Re: Hide local IP from non delivery notifications

[Daryl Richards]

On 2023-02-15 6:41 a.m., Claudio Corvino wrote:
Ok thanks for your answer but I have another question: if I reject the 
e-mail instead of sending the non delivery notification, how can a 
"good" user be notified of the fact that his e-mail was not delivered?


Claudio


That should be the job of the sender's MTA, not you.

Re: Hide local IP from non delivery notifications

[Claudio Corvino]

Ok thanks for your answer but I have another question: if I reject the 
e-mail instead of sending the non delivery notification, how can a 
"good" user be notified of the fact that his e-mail was not delivered?


Claudio

On 14/02/23 19:48, dove...@ptld.com wrote:
I have an external MTA configured with Postfix that delivers email 
to an internal IMAP/LMTP

Dovecot server configured to bind an LDAP to check if users exist.


You should have postfix do the checking for whether or not users exist
and then have postfix reject and deny the message.  Then you don't
care because the IP of the postfix server is almost certainly your MX 
server.



Plus backscatter. Sending a fail notification back to the sender (vs 
rejecting) puts your mail server at risk of sending spam to email 
accounts that had their address forged. And thus maybe yoru server 
being added to a spam blacklist.


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Description: S/MIME Cryptographic Signature

Re: Hide local IP from non delivery notifications

[Claudio Corvino]

You're right, I think is the only way, or at least one of the simple method
to accomplish this.
I'll try, thanks!

Regards

Claudio


Il mar 14 feb 2023, 19:35 John Stoffel  ha scritto:

> > "Claudio" == Claudio Corvino  writes:
>
>
> > I have an external MTA configured with Postfix that delivers email to an
> internal IMAP/LMTP
> > Dovecot server configured to bind an LDAP to check if users exist.
>
> You should have postfix do the checking for whether or not users exist
> and then have postfix reject and deny the message.  Then you don't
> care because the IP of the postfix server is almost certainly your MX
> server.
>
> > If the user does not exist, my MX sends a non delivery notification,
> > and into the e-mail there's the local IP address of the Dovecot
> > server.
>
> > I can't find a way to remove or hide that IP, here is an example of line
> that contains the IP
> > (with X) that I would like to hide/remove:
>
> > "The mail system
>
> > : host hostname.domain.com[XXX.XXX.XXX.XXX] said: 550"
>
> > Thanks in advance!
>
> > Cheers
>
> > --
> > Claudio
>
>

Re: Hide local IP from non delivery notifications

[dovecot]

I have an external MTA configured with Postfix that delivers email to an 
internal IMAP/LMTP
Dovecot server configured to bind an LDAP to check if users exist.


You should have postfix do the checking for whether or not users exist
and then have postfix reject and deny the message.  Then you don't
care because the IP of the postfix server is almost certainly your MX server.



Plus backscatter. Sending a fail notification back to the sender (vs rejecting) 
puts your mail server at risk of sending spam to email accounts that had their 
address forged. And thus maybe yoru server being added to a spam blacklist.

Re: Hide local IP from non delivery notifications

[John Stoffel]

> "Claudio" == Claudio Corvino  writes:


> I have an external MTA configured with Postfix that delivers email to an 
> internal IMAP/LMTP
> Dovecot server configured to bind an LDAP to check if users exist.

You should have postfix do the checking for whether or not users exist
and then have postfix reject and deny the message.  Then you don't
care because the IP of the postfix server is almost certainly your MX server.

> If the user does not exist, my MX sends a non delivery notification,
> and into the e-mail there's the local IP address of the Dovecot
> server.

> I can't find a way to remove or hide that IP, here is an example of line that 
> contains the IP
> (with X) that I would like to hide/remove:

> "The mail system

> : host hostname.domain.com[XXX.XXX.XXX.XXX] said: 550"

> Thanks in advance!

> Cheers

> --
> Claudio

Hide local IP from non delivery notifications

[Claudio Corvino]

Hi everyone,

I have an external MTA configured with Postfix that delivers email to an
internal IMAP/LMTP Dovecot server configured to bind an LDAP to check if
users exist.

If the user does not exist, my MX sends a non delivery notification, and
into the e-mail there's the local IP address of the Dovecot server.

I can't find a way to remove or hide that IP, here is an example of line
that contains the IP (with X) that I would like to hide/remove:



*"The mail system: host hostname.domain.com
[XXX.XXX.XXX.XXX] said: 550"*

Thanks in advance!

Cheers

-- 
Claudio