Use /etc/aliases for outgoing mail relayed by postfix with local domain

Question

I'm using Ubuntu 12.04 with postfix configured as satellite system that relays outgoing mail to Gmail. For sake of example, my registered domain is example.com I want root cronjobs' error output to be mailed to my real [email protected] inbox. I have this relay working correctly.

But these root cronjobs are set by default to email to [email protected] which isn't a real email address. I have in my /etc/aliases:

root: [email protected]

example.com isn't listed in postfix's main.cf's mydestination so postfix doesn't think this mail is local. It bypasses processing via /etc/aliases and tries to send to [email protected].

A workaround is adding MAILTO=david at the top of each cron file. But there are many. Another workaround is to setup [email protected] as a real inbox that forwards to [email protected]. Is there a better way? I.e. is there a way to relay emails that have local domains but still process their addressee with /etc/aliases?

Solution 1

I guess you could use a virtual alias.

If example.com is your domain on postfix:

in /etc/postfix/main.cf

virtual_alias_maps = hash:/etc/postfix/virtual

in /etc/postfix/virtual

[email protected]    dave

after editing

postmap hash:/etc/postfix/virtual

It should be working.

If I understood your question correctly, emails to [email protected] will now go to local user dave.

Solution 2

Another solution is to use the recipient_canonical_maps configuration parameter of postfix. Compared to the virtual_alias_maps, the advantage is that myorigin neither needs to be in mydestination nor in virtual_mailbox_maps (which virtual_alias_domains defaults to). Thus, this postfix instance does not become the final destination for myorigin.

Add this to your main.cf:

recipient_canonical_maps = hash:/etc/postfix/recipient_canonical

Then create a file named /etc/postfix/recipient_canonical and enter something like this:

[email protected] [email protected]

Finally hash it.

# postmap /etc/postfix/recipient_canonical

Solution 3

if david is also a local account, then you could have the alias line be local-only, and then set up the david account to do the forwarding. /etc/aliases would be:

root: david

You could then use other postfix rules or a .forward file on the david account to get the mail to gmail.

Comments

[MᴀʀɪᴜsᴢS]

This works for Centos 6 :) Thx

[MᴀʀɪᴜsᴢS]

This is not working with relaying...