Postfix: Set custom SMTP Banner based on address used to access server
The parameter can only be set once, so you will not be able to dynamically change it, however you can override it in Postfix's master.cf
file as explained in this SF answer.
The only way (that I know of) is for you to run several Postfix instances as you suggested, however for the sake of a SMTP banner, I personally think this is overkill.
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Updated on September 18, 2022Comments
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Admin almost 2 years
The Postfix parameter
smtpd_banner
sets the text of a server's SMTP greeting banner. The default setting is:smtpd_banner = $myhostname ESMTP $mail_name
My mail server has several unique IP addresses assigned to it, one per domain for which it hosts email. In other words, something like this:
203.0.113.1
forexample1.com
203.0.113.2
forexample2.com
203.0.113.3
forexample3.com
A sending server wanting to send email to
[email protected]
would access the server usingexample2.com
and203.0.113.2
.I would like the SMTP banner to reflect the domain that is being used to access the mail server. For example, someone accessing the server using
example2.com
or203.0.113.2
should see the SMTP Banner:example2.com ESMTP Postfix
Anyone accessing using the other domains or IP addresses should see the respective domain printed in the place of
$myhostname
in the default setting.Is this possible with Postfix, preferably without running multiple instances of Postfix, and if so, how?