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Looked at the instructions in the second paragraph of screenshot and setting there are correct too. Mail and Webmail are set to use certificate for www.mysite.co.nz. To confirm. POP3 and SMTP are using this certificate. IMAP is not.

Think I'm there now. Looking at settoing for my own domain. Looks correct to me. Webmail still doesn't like it...

It's the co-hosting situation that bothers me. If I change from 'default' to the domain certificate (mydomain.co.nz) with that upset the other websites on the VPS that have their own certificates assigned?

Hi @learning_curve I'll need to print out what you said there to process it... but thanks for the feedback. Just in case this has a bearing on what you said: My Plesk-enabled VPS hosts a number of client websites, including my own. Some of these websites have mail accounts associated with...

@learning_curve -- you mean like this?

Hi @learning_curve -- by 'sanitised' I assume you mean 'redacted'??

I delved a bit deeper and Firefox revealed more info. Definitely looks like a certificate thing. How do I resolve it?

I'm asking this question again in order to (hopefully) generate more discussion and hopefully resolve my issue. Late May this year the LetsEncrypt Security certificate on my domain expired and auto-renewed. The resulting chain of events caused a lot of angst and service disruption that I won't...

@Peter Debik , I think the fact that Webmail (which uses IMAP I believe) can't log in because of a certificate issue is at the root of the problem. Just checked again and both Webmail and *Wildcard are secured with a valid certificate. I'll be checking ports now. Thanks for this information.

Thanks for your concise reply @Peter Debik . Just a few more points to clear up: I am using the same (official) domain (NOT mail.mydomain.co.nz) on all devices. I am using the same username/passwords on all devices (for my wife's account and mine. These settings have now enabled POP3 and SMTP...

Hi again @Peter Debik -- thanks heaps for your support so far, back with a few questions: As a Plesk staff member, can you tell me the 'official' Plesk position on Courier IMAP/POP3/SMTP service. From what I've read I believe that Dovecot is preferred. I'm not wanting to lose the service I have...

Sorry @Peter Debik -- not quite as simple as that. I was attempting to 'obfuscate' my domain name (call me paranoid but this is a public forum). So I made up 'mail.mysite.co.nz' which is, of course, completely fictitious... it was just there as a placeholder/example. In fact yes, I am using my...

@Peter Debik –– thinking out loud here: When I first had this problem (February) I resolved it but switching from Dovecot to Courier. At the time it restored ALL mail service to all hosted email accounts on my VPS (on various domains. After recent problems I switched back to Dovecot. I...

Thought I'd check out what Chrome made of the webmail situation: Still pointing to a server certificate thing...

Thanks for your feedback @Peter Debik . It’s great to have a list of steps that I can work through. I’m trying to set out what happened/is still happening here. As far as I can see, this problems started after something changed on the server (Security Certificate validation??). I had no problems...

Checked my IP address. Normally I'm on WIFI so IP is the same as computers. It's not blocked by fail2ban...

Hi again @Peter Debik -- if my servername is OK (same as my wife's settings), and I"m using MY correct username and MY correct password, can't see why the connection isn't working. Can try tracing the IP (don't know anything about fail2ban or if it's even running -- if it's a standard Plesk...

Oh -- and further to this, SMTP is working on my wife's iPhone. I duplicated her settings on my phone (ports, ect) but it's not working on mine. Phones are the same... same OS ???

Thanks @Peter Debik -- that looks really interesting... although MacMail and Thunderbird are now working OK over POP with Dovecot. So it looks as if we're past the certificate issue... ? What's the deal with IMAP? Thinking about removing Dovecot and reinstalling it via command line. If there a...

It's happening again!! Started when my security certificate self-renewed. Was unable to send email on one POP3 machine or via IMAP from one email account. Others were working fine. Fiddled about with server, enabled sending on Pop3 machine but could not send or receive on IMAP. Webmail...