Hello, I followed the directions located at: https://www.howtoforge.com/tutorial...l-pureftpd-bind-postfix-doveot-and-ispconfig/ Everything seems to work except when I send email. In thunderbird I get the error "The certificate is not trusted because it is self-signed." I try in webmail and I get SMTP ERROR (250): Authentication Failed. I am seeing alot of these messages in /var/log/mail.log: Sep 27 18:28:28 localhost postfix/submission/smtpd: warning: TLS library problem: error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate:../ssl/record/rec_layer_s3.c:1543:SSL alert number 42: I cannot seem to figure it out. Can someone please give me some advice? I should note that this is on Ubuntu 20.04 LTS Thank you in advance.