If you have a customer that has moved their mail off your server to a 3rd party like gmail, or outlook, and they try sending an email to that domain from another domain on your server and get an error like this:
2015-04-13 02:49:31 H=([123.123.123.123]) [123.123.123.123]:55156 sender verify defer for <[email protected]>: lowest numbered MX record points to local host
The issue is that the domain is setup as a local domain in the exim configuration, but the MX records are setup to point to a remote server. When this is setup like this, the email the account on your server trying to send to them is trying to deliver it locally instead of remotely.
To correct this, do the following:
- Login to your WHM
- Click on Edit MX Entry
- Click or type in the domain name
- Click on edit
- Change the Email Routing from Automatic OR Local to Remote.
- Click on Save
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