Guides from the NOC

Mail delayed or stuck in the Exim queue on cPanel? Learn how to find frozen messages, diagnose the cause, and clear the queue safely with exiqsumm and exim -...

Emails going out fine but arriving hours late with no bounce? Learn how SMTP greylisting works, how to confirm it in Exim logs, and how to fix it fast.

cPanel Exim rejecting outbound mail with 'relay access denied'? Learn why it happens and how to fix envelope sender, SMTP auth, and ACL issues.

Mail still bouncing after you fixed SPF, DKIM and PTR? Learn how to set your VPS hostname and FQDN correctly for Postfix, Exim and WHM.

Learn how cPanel Email Filters work, block senders, auto-forward invoices, and avoid the backscatter mistake that silently tanks your domain deliverability.

Hitting cPanel's max emails per hour limit? Learn why WHM caps outbound mail, how to check Track Delivery, and how to safely raise or fix the limit.

Set up cPanel autoresponders correctly and fix common issues: mail loops from a zero interval, replies that never fire, and auto-replies landing in spam.

Mail bouncing or looping even though MX records look right? Learn how cPanel Email Routing works and fix Local vs Remote Mail Exchanger misconfigurations.

Learn how to set up cPanel email forwarders and default addresses, fix mail loop errors, and stop forwarded mail from silently landing in the spam folder.

Email bounced back with a strange SMTP code? Learn what 550, 552, 554, and 421 errors mean and the exact fix for each, from cPanel and WordPress mail.