Dunno, sometimes the mail client says it's using the port you set it to, but doesn't. It can't be the server's fault because others are using that hostname/port combination and it works for them. Other than the configuration, the only other thing it could be is the type of SSL that the client is using. If it's the older TLS 1.0, chances are the new mail server is rejecting it because it's not secure enough. Most mail servers expect to see TLS 1.3 now for security reasons. Senacor never updated their system to allow for TLS 1.3 so newly released versions of Thunderbird that relied on it flat out didn't work on it. When HN moved to the new mail server, suddenly Thunderbird began to work again. So, although it may seem like it's singling you out, and I understand you may be frustrated, please don't take it personal. It's likely the mail client you're using that's the problem.
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