A lot of client complain that there external mail account in gmail doenst work. I have test it with a new account and its true. If you select port 993 then you get a error: "SSL error: unable to verify the first certificate". Nothing is change about the SSL cert, the only thing what I did was update ISPConfig. I dont understand what is going wrong. I have restore dovecot.conf from a backup, but still its not working. Yes it works perfect in Thunderbird and Webmail (roundcube) works fine as well. Any thoughts?