One of our Linux VPS customers faced the problem wherein the customer was unable to receive emails from some specific email accounts.
<[xx.xx.xx.xx] #5.0.0 smtp; 5.1.0 - Unknown address error 550-'Verification failed for <[email protected]>
The mail server could not deliver mail to [email protected]. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries. Sender verify failed' (delivery attempts: 0)
- Login to WHM. Under Service Configuration, select Exim configuration Manager.
- Under Basic editor , select the Mail tab. Set sender verification callouts = Off. Click on Save button to save the changes.