Reject emails from a subdomain in Exim4

Tom

4/5/24, 5:04 PM

Is it possible in Exim4 to reject emails sent to a subdomain, eg sub.example.com?

A user has started a loop that is sending too many emails to the server, which generates the error "refused: too many connections".

Or is it possible to temporarily reject for a specific email address, eg [email protected]?

1 + 0

linux

exim

Score:0

Server

Saxtheowl

4/5/24, 6:27 PM

Yes you can do that with the ACL rule file, located /etc/exim4/exim4.conf.template or /etc/exim4.conf

Here would be your ACL rule file:

acl_check_rcpt:
  ...
  # Reject all mail to sub.example.com
  deny domain       = *.sub.example.com
       message      = This subdomain is not accepting email.

and if you want to reject a specific mail address:

acl_check_rcpt:
  ...
  # Reject mail for [email protected]
  deny local_parts  = new-task
       domain       = sub.example.com
       message      = This email address is not accepting email.
  ...

then restart sudo service exim4 restart

+ 0

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EN: Reject emails from a subdomain in Exim4

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