Email security
Set up business email with the right secure settings
Find your provider settings, use TLS and test incoming and outgoing mail separately.
Read the guide
Start with one failed message, its time and its error. Changing several mail settings at once can make a simple problem harder to identify.
Find out which direction is failing
Test receiving from an unrelated mailbox, sending a new message and replying. Compare webmail with the desktop or phone app. If webmail works, the app settings deserve attention before DNS or server configuration.
Sender and recipient addresses
Approximate time and time zone
Full delivery error or bounce
Whether webmail also failsDo not include mailbox passwords in a support ticket. Keep the original error or message headers where possible, removing unrelated personal information from what you share.
Check the mailbox and delivery evidence
Check mailbox quota and account status. In cPanel, Track Delivery can show what happened to a message when the feature and relevant records are available. Read the actual response: a rejection, temporary delay and accepted delivery are different outcomes.
If the recipient service accepted the message, it may still have put it in spam or applied a mailbox rule. A local success message is not a guarantee of inbox placement. Check the receiving mailbox and any forwarding or filtering rules.
Review routing and authentication
Check that MX records point to the service receiving the domain mail. Use Email Deliverability in cPanel to review recommended authentication records where available. If another provider hosts DNS or email, make the change at the correct service.
dig MX example.com
dig TXT example.com
dig TXT _dmarc.example.comPreserve existing legitimate senders when fixing SPF or DKIM. If email moved recently, check cPanel Email Routing as well as DNS; local and remote delivery assumptions can send messages to the wrong place.
Retest one change at a time
Repeat the original test after a specific change and allow for DNS caching where relevant. Avoid repeatedly resending large batches while investigating a rejection. Check the mail-provider error guidance for rate limits or policy failures.
If you need support, supply the example addresses, time and exact error through the normal support channel. For a VPS sending mail directly, provider-managed SMTP access and IP reputation are separate considerations from cPanel mailbox settings.
