I’m new to eM Client, and can’t get it to work. I keep getting the message Server says “LOGIN failed”. Later I got 5.7.57 Client not authenticated to send mail. BL1PR13CA0017_namprd13_prod_outlook_com
But my email address and password are correct, and my server settings are the same as I use in Thunderbird.
Incoming: IMAP type, outlook_office365_com, port 993.
Outgoing: smtp_office365_com, port 587.
(In this post I had to substitute underline characters for dots, so the forum won’t treat them as links and tell me I can’t post them.)
In Thunderbird I use SSL/TLS for incoming and STARTTLS for outgoing, and OAuth2 for both. I don’t see those options in eM Client, so I tried all 4 Security policy options instead.