~ overflow ~

Problem:

There’s some domains on a server that users a external server to process the emails (eg. google servers, aspmx.l.google.com) those emails are all fine when sent from outside the box but when sent from the box they fail to reach the destination or get delivered to a local user.

Solution:

define(`MAIL_HUB', `example.com.')dnl
define(`LOCAL_RELAY', `example.com.')dnl

For sendmail, this will make the domain’s emails to be delivered to the ip address assigned at the domain’s MX record.

Note:

This seemed promising for me at first look, but it will redirect ALL local domains to this MX record, ruining everything. Nothing new when dealing with sendmail, anyway when i find a better solution for this i will update this post again.

Source:

ServerFault