IMAP Invalid protocol /error help

I am new and have been using the eM Client for about 45 days. I’ve recently started receiving an error pop up when I open the client each morning. I cannot find why it is doing this or how to stop it.

I am a beginner in understanding this stuff, so your help is appreciated.


Is there a way to resolve this? My IMAP settings seem to be OK in my account set up? Again- I am a beginner so not sure what else to check/set?

thank you

Can you please give a screenshot of your IMAP settings?

yes sorry- it only allows me to upload 1 screenshot at a time due to me being new…

Also- when I go to the Diagnostics tab- it does “pass” the IMAP and SMTP test

Change the port to 993 and the security policy to Use SSL/TLS on special port (legacy)

That is the best option.

But if you want to use port 143, change the security policy to Use SSL/TLS if available

Thank you- I tried both those options and am still getting the Error. as listed in the first post.

If it was working, then suddenly it wasn’t, I suspect it may have to do with the provider.

Contact them and see what they say.

BTW, I had a quick look on their site, and the server is, not Don’t know if that would make a difference.

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Please open the menu Settings->Advanced->Logging and check “IMAP” under the problematic account. Restart eM Client, try to simulate the issue and send us the logs using the same logging settings window at Then I will be able to advise you further. Thank you.

For Future reference / reviewing of this topic. A help ticket was created and I sent( per requested) the logs. Eventually, I was sent a link to download an updated version ( 8.2.1226.0 ) and I am now up and running without issues.
Thank you