Some internet providers block outgoing SMTP connections on port 25. In this case, mail programs may receive a connection error even when the mailbox password is correct.
Use an alternative SMTP port:
- SMTP without SSL: 587 or another port provided for your hosting panel.
- SMTP with SSL/TLS: 465.
Also check the SMTP server name, mailbox login, password and authentication settings in the mail client.
What to check after following this guide
After changing settings, make sure the result works not only in the control panel but also for real website visitors or mailbox users. Test without browser cache and avoid changing many settings at once unless you know exactly what each change does.
For email, test receiving and sending separately. Delivery issues often depend on MX, SPF, DKIM, DMARC, SMTP authentication or mailbox password settings.
- use the full email address as the username;
- check IMAP/POP3 and SMTP settings;
- save the exact error or bounce message.
When to contact GoodNet support
If the guide is not enough, contact GoodNet support. Include the domain, service name, when the issue started, what you already checked and the exact error text. This helps support move directly to diagnostics.
Practical tip
If this guide affects a live website, domain or mailbox, check the result from the user side after making changes: open the page without browser cache, send a test email or verify the required record with an external tool. Keep the previous settings until you are sure the new configuration works correctly.
When contacting GoodNet support, prepare the domain name, service name, a short description of the issue, when it started and a screenshot or the exact error text. This helps support identify the cause faster and avoids repeating basic checks.