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Connecting to Plesk Obsidian mailbox with Thunderbird 91

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I am having difficult connecting to mailboxes in Plesk Obsidian on a VPS. I can set up the mailboxes in Plesk and make a note of the password. I then go into TB and start the 'Add Mail Account' process. All goes well at first. I get a green message saying 'Configuration found by trying common server names' (automatic connection). When I click 'Done' TB whirrs for a bit and then comes back with a green message showing a tick and 'Checking Password' but an orange message saying 'Unable to log in at server. Probably wrong configuration, username or password'. If I try manual configuration I get a similar sequence (using ports 995 and 465, SSL/TLS and 'Normal password').

I do not have this problem when working with cPanel (on a different server, but very similar mailboxes and security settings). This suggests to me that there's something amiss in my Plesk settings, but what could it be?

I have searched around without success. Most articles that might help are for TB 31 (even the Plesk Obsidian on-line manual). Any suggestions, please?

I am having difficult connecting to mailboxes in Plesk Obsidian on a VPS. I can set up the mailboxes in Plesk and make a note of the password. I then go into TB and start the 'Add Mail Account' process. All goes well at first. I get a green message saying 'Configuration found by trying common server names' (automatic connection). When I click 'Done' TB whirrs for a bit and then comes back with a green message showing a tick and 'Checking Password' but an orange message saying 'Unable to log in at server. Probably wrong configuration, username or password'. If I try manual configuration I get a similar sequence (using ports 995 and 465, SSL/TLS and 'Normal password'). I do not have this problem when working with cPanel (on a different server, but very similar mailboxes and security settings). This suggests to me that there's something amiss in my Plesk settings, but what could it be? I have searched around without success. Most articles that might help are for TB 31 (even the Plesk Obsidian on-line manual). Any suggestions, please?
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Chosen solution

It turned out to be a port problem. I thought they'd been opened, but they had not.

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Chosen Solution

It turned out to be a port problem. I thought they'd been opened, but they had not.