When you can receive mail but cannot send, the problem is almost always with the outgoing (SMTP) server settings. Work through these checks in order.
Check SMTP Settings
| Setting | Correct Value | | --------------- | ------------------- | | Outgoing server | mail.yourdomain.com | | SMTP port | 465 | | Encryption | SSL/TLS | | Authentication | Enabled | | Username | full email address |
- Confirm the outgoing server is mail.yourdomain.com, not your ISP's server.
- Set the SMTP port to 465 with SSL/TLS.
- Enable outgoing server requires authentication and use the same username and password as incoming.
Other Common Causes
- Wrong password. Reset the mailbox password in cPanel and update your client.
- Mailbox over quota. A full mailbox can block sending; free up space or raise the quota.
- ISP blocking port 25. Never use port 25 for sending; use 465 instead.
- IP blacklisted. If the server IP is blocked, mail to certain providers fails. Check for blacklisting.
Test From Webmail
Log in at yourdomain.com/webmail and try sending a message. If webmail sends successfully, the problem is in your mail client settings, not the server.
Still Stuck?
If webmail also cannot send, there may be a server-side issue. Contact support on WhatsApp at +254 796 358081 or via the /contact page with the exact error message.