I know that this might seems to be a lame question but hey , let me give it a try ...
Hi, I am hosting different domains and trying to configure postfix to send mails through sendgrid for certain domains with different authentication, and the rest of the remaining domains to use postfix's local settings to send mail normally i.e using my default relay host, here is what I managed to compile from their website and added my settings
/etc/postfix/main.cf: smtp_sender_dependent_authentication = yes sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relay smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd relayhost = my.default.relay.com /etc/postfix/sasl_passwd: # Per-sender authentication; see also /etc/postfix/sender_relay. firstname.lastname@example.org apikey:thatAPIkeyfromSendGrid @domain1.example1.com username1:password1 @domain2.example.com username2:password2 # Login information for the default relayhost(which is?) [my.default.relay.com] username:password /etc/postfix/sender_relay: # Per-sender provider; see also /etc/postfix/sasl_passwd. @domain1.example.com [sendgrid.net]:submission @domain2.example.com [sendgrid.net]:submission
Now for some reason , I cannot figure it out my
default relay host?
relay_host = $domain
relay_host = [my.default.relay.com]
In the end I still get
mail for [my.default.relay.com] loops back to myself, off course I did the postmaps of sender_relay,sasl_passwd and change them to chmod 600
Can you help on finding out what my
default relay host is? Or a possible way to solve my problem?
PS: I am not into Open Relay though