Outgoing mail problems almost always come down to one of a small number of causes. Work through these in order:
- Incorrect SMTP settings — confirm the outgoing server, port, and encryption method match exactly what's shown in DirectAdmin's email account page.
- Mailbox storage full — a full mailbox can silently block outgoing mail; check usage in DirectAdmin and clear old messages if needed.
- SPF/DKIM misconfiguration — if mail sends but bounces or lands in recipients' spam, check the domain's TXT records are set up correctly under DNS Management.
- Password recently changed — update the saved password in your email client if it was changed in DirectAdmin but not updated on the device.
If none of these resolve it, open a support ticket with the exact error message shown by your email client — it usually points straight to the cause.