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Subject Topic: SMTP authentication failing after update Post ReplyPost New Topic
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molendinary
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Posted: 26 May 2026 at 2:29am | IP Logged Quote molendinary
Hi everyone,

I recently updated AfterLogic WebMail Pro to the latest version on my server, and since then I’m having trouble sending emails.

Incoming mail (IMAP) works fine, and I can log in without any issues. However, whenever I try to send an email, I get an SMTP authentication error saying “Unable to authenticate with outgoing mail server.”

Before the update, everything was working normally with the same SMTP settings. I haven’t changed the mail server configuration (host, port, username, or password), so I’m not sure what broke during the upgrade.

I’m using SMTP over SSL with port 465, and my mail server is hosted on a cPanel server.

Has anyone else experienced this after updating WebMail Pro? Could it be related to changes in how credentials are handled or TLS settings in the new version?

Any help or suggestions would be appreciated.
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Alex
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Posted: 26 May 2026 at 2:55am | IP Logged Quote Alex
Hi,

Enable logging in Admin panel, try again and check the logs. They may provide more details on which step the issue occurs.

Regards,
Alex
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Alex
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Posted: 26 May 2026 at 2:57am | IP Logged Quote Alex
https://afterlogic.com/docs/webmail-pro/troubleshooting/debug-logging-as-main-troubleshooting-measure
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Cedrisamb
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Posted: 16 June 2026 at 1:46am | IP Logged Quote Cedrisamb
I would also check whether port 587 with STARTTLS works, as some servers are becoming stricter about SSL on port 465. Comparing the SMTP logs before and after the update might help narrow down whether it is a TLS issue or a credential handling change.
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