Tuesday, June 16, 2020

Postfix outgoing mail limit per domain

 Limit outgoing mail 

Global configuration::

vi /etc/postfix/
smtp_destination_concurrency_limit = 2
smtp_destination_rate_delay = 1s
smtp_extra_recipient_limit = 10

  • default_destination_concurrency_limit: This means that postfix will up to two concurrent connections per receiving domains. The default value is 20.
  • default_destination_rate_delay: Postfix will add a delay between each message to the same receiving domain. It overrides the previous rule and in this example, it will send one email after another with a delay of 1 second. If you want to disable this rule, either delete it or set to 0.
  • default_extra_recipient_limit: Limit the number of recipients of each message. If a message had 20 recipients on the same domain, postfix will break it out to two different email messages instead of one.
Then restart your Postfix.

 Limit outgoing mail by domain

You can limit per domain if you want like this:
Configuration File vi /etc/postfix/
transport_maps = hash:/etc/postfix/transport
# Throttle limit policy mail (global)
smtp_destination_concurrency_limit = 4
smtp_extra_recipient_limit = 2
# Polite policy
polite_destination_concurrency_limit = 3
polite_destination_rate_delay = 2s
polite_destination_recipient_limit = 5
# Turtle policy
turtle_destination_concurrency_limit = 2
turtle_destination_rate_delay = 1s
turtle_destination_recipient_limit = 2

Then add domains with the wished policy:
Configuration File vi  /etc/postfix/transport polite: polite: turtle: turtle: turtle:

Edit master configuration to inform postfix of those config. Add those lines:
Configuration File vi /etc/postfix/
polite unix - - n - - smtp
turtle unix - - n - - smtp

Postmap and reload:
postmap /etc/postfix/transport
service postfix reload

Now Send mail check log

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