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For 2 days I have been unable to use Thunderbird on my Ubuntu 18.04 desktop to login to my remote production pop3 server (Postfix, Ubuntu 16.04). Access is denied with message authentication failure; rhost=185.244.41.45. When I do a whois on that ip I find it's in the Russian federation. When I login to Apache on that server from my desktop (Firefox) access is allowed. When I login to apache from my phone using firefox access is denied.

Access to other sites and email addresses on that server are unaffected from desktop and phone. What is going on and how do I stop it?

Thank you

MGibbons
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  • Have you tried to use another pop3 client? – Marat Gainutdinov Dec 04 '20 at 21:47
  • mutt -f imap://username@ip_address – Marat Gainutdinov Dec 04 '20 at 21:47
  • Check the logs on the mail server. – Michael Hampton Dec 04 '20 at 22:12
  • mutt gave the response Could not connect to xx.xx.xx.xx (Connection refused). Which is what I had already learned from the server log. – MGibbons Dec 04 '20 at 22:20
  • A traceroute didn't show the request going through 185.244.41.45. – MGibbons Dec 04 '20 at 22:27
  • My greater concern is not being able to access Apache from my Android phone. Both Brave and Firefox give connection refused response. Access from Desktop not a problem. Nothing in the Apache log shows an error for my external IP address, so I can't trouble shoot the phone access. – MGibbons Dec 04 '20 at 22:44
  • I found the solution. On Android, the browser was checking the domain registration which expired 2 days ago. On the desktop, only the certificate was being verified. Thunderbird must have been checking the registration also. All good now. Thank you for the help. – MGibbons Dec 04 '20 at 23:22

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I resolved the problem. On Android, the browsers were checking the domain registration, which expired 2 days ago. On the desktop, only the certificate was being checked. I presume Thunderbird was also checking the registration.

MGibbons
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