I installed Let’s Encrypt via Plesk to encrypt my outgoing & incoming emailtraffic. The webmailer works fine but I wanna add my emailaccounts to the Apple Webmailer and onto my Android phone into the Gmail app.
They worked pretty fine (without SSL/TLS). But now whenever I wanna activate the SSL connection both programs answer that the certificate is not valid.
Can you help me out here? Im not familiar with this whole certificate stuff at all… I tried to play around with the email ports but that doesnt work.