Suddenly gmail can't fetch anymore mails from my mail server (postfix, dovecot), with the below message:
Unable to establish secure SSL connection to mail.domain.com Server returned error: "SSL error: Certificate 1 of the best path has an error"
We didn't do any recent changes on our server, we are using tls v1.2, on all pop3, imap and smtp,
SMTP is still working okay on gmail,
Any other mail clients like Thunderbird, outlook, mail exchange ..etc are working fine with out server
Edit: I checked multiple pop3 ssl validation websites and command line like "
openssl s_client", and our server passed all