Applicable to:
- Plesk for Linux
Question
Is it possible to have different SMTP banners for different IP addresses on the Plesk server?
Each IP address has different PTR records, and they do not match SMTP banners.
Answer
There is no such functionality in Plesk yet. Vote for this feature at our User Voice portal.
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To set up SMTP banner for outgoing traffic define
smtp_helo_namefor specific IP address in/etc/postfix/master.cfconfiguration file:CONFIG_TEXT: plesk-203.0.113.2- unix - n n - - smtp -o smtp_helo_name=example2.com -o smtp_bind_address=203.0.113.2 -o smtp_bind_address6= -o smtp_address_preference=ipv4
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To set up SMTP banner for incoming traffic do the following in
/etc/postfix/master.cfconfiguration file:
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Comment out:
CONFIG_TEXT: smtp inet n - n - - smtpd
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Add one entry per address:
CONFIG_TEXT: 127.0.0.1:smtp inet n - n - - smtpd -o smtp_helo_name=localhost -o smtp_bind_address=127.0.0.1 -o myhostname=localhost
x.x.x.x:smtp inet n - n - - smtpd -o smtp_helo_name=mail.domain_x.com -o smtp_bind_address= x.x.x.x -o myhostname=mail.domain_x.com
y.y.y.y:smtp inet n - n - - smtpd -o smtp_helo_name=mail.domain_y.com -o smtp_bind_address=y.y.y.y -o myhostname=mail.domain_y.com
Note: the file may be overwritten during Plesk updates, back it up.
In some cases, it might be required to use -o inet_protocols=ipv4 flag in the lines (like below). However, in majority of cases it is not required. Check the postfix/inet_protocols for more info.
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