Hey, In my log is this: Code: Nov 25 00:26:33 mail postfix/smtps/smtpd[1441]: warning: TLS library problem: error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:332: How can i fix this? The certificate is from Lets Encrypt Using Debian 10.2.0 Newest ISPConfig Followed this Tutorial: https://www.howtoforge.com/perfect-server-debian-10-nginx-bind-dovecot-ispconfig-3.1/ I try to use in a CMS the SMTP for Mails and use Port 465, but it wont connect If i use rainloop and try there port 465 it Work. Any ideas
Use this excellent tutorial to get certificates for your host and services, including postfix. https://www.howtoforge.com/tutorial/securing-ispconfig-3-with-a-free-lets-encrypt-ssl-certificate/
