By default, sendmail (I have version 8.13 on an RHEL4) allows only local mails.

I wanted to allow mails from a particular network to be relayed via the system, so I did the following based on suggestions from various places :

  1. /etc/mail/access : Added the subnet and the domain 8.37 RELAY mydomain.com RELAY (I assume this is the originating email's domain)

This alone did not work, so I added the following to sendmail.mc FEATURE(access_db)dbl

Now, the problem is that it is allowing access from other domains as well. To test it out, I removed 8.37 RELAY from the access, and changed the email from field to abhinav@notmydomain.org

However, I still receive the mail.

What is the correct way to configure this, so that only mails from a particular subnet are relayed ?


The correct syntax to allow a subnet to relay is:

Connect:192.168                 RELAY

How are you testing whether or not the server is disallowing relaying? Make sure that when you do your relay test, you're not trying to send mail to a domain hosted by the mail server. It'll accept it. Try using an external host to relay mail through your server to, say, gmail.

| improve this answer | |
  • 1
    For IPv6 use something like: Connect:IPv6:2001:0db8:85a3 RELAY – Milan Kerslager Apr 3 '19 at 19:44

Try using the "Connect: RELAY" method in access, allowing relay from the subnet and rejecting the rest.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.