How to Troubleshoot Cannot Send Email
When sending fails but receiving works, the cause is almost always the outgoing (SMTP) settings. Work through these in order.
Step-by-step
- Check the SMTP port and security. Use port 465 with SSL/TLS (or 587 with STARTTLS) — never port 25. See ports and SSL.
- Enable SMTP authentication. Your client must "use same settings as incoming" / require authentication for the outgoing server — this is the most common cause.
- Confirm the username is the full email address and the password is correct (re-type it).
- Test on another network. Some offices/ISPs block sending ports — try mobile data to rule the network out.
- Send via webmail to confirm the account itself can send — if webmail works, the issue is your client's settings.
- Check you are not over quota or limits — a full mailbox or sending limit can block sending too.
💡 Good to know
- Port 465 + SSL + authentication is the combination that works on EconomicalHost servers.
- If webmail sends fine, the problem is definitely in your mail app configuration.
- Bulk sending is prohibited and can suspend sending — keep to normal correspondence.