Update README.md

Replaced 933 for 993, the correct port for IMAP.

Fix: Opendkim won't start: can't open PID file?

Fix typo in LICENSE filename

Update emailwiz.sh

Make gmail's less angry

Update emailwiz.sh

Ubuntu can't run multiple lines without a special character, thus making the script malfunction, putting the commands on the same line solves the problem and the script can be used on Ubuntu 20.04

Fixes for custom subdomain names

Enforce TLS1.2 connections

Add extra troubleshooting points, minor readability changes

documentation changes

Make README clearer about PTR record

Fixed Tiny Grammar Error

Literally added one letter

Minor change for dovecot.conf to work on v2.3

According to the wiki (https://wiki.dovecot.org/SSL/DovecotConfiguration):

"From version 2.3, you must specify path to DH parameters file using:
ssl_dh=</path/to/dh.pem"

This actually threw an error something along the lines of: "imap-login: Error: Failed to initialize SSL"

remove smtp_tls_CAfile from postfix main.cf

Change Dovecot/Postfix definition