Am 05.05.2016 um 16:18 schrieb Gary Stainburn: > I've tried the changes that I put below. Users are still able to log in from > the LAN. > > However, despite putting the appropriate rule in my firewall allowing port 143 > I cannot create a user on a PC outside my network. > > I'm using Thunderbird to do the testing. Is there a better way to test my > setup? Thunderbird doesn't give any diagnostic data, it just says it's > failed to test the account. Connect with: openssl s_client -connect <your server IP address>:143 -starttls imap Then issue IMAP commands: 01 CAPABILITY 02 LOGIN user password 03 LOGOUT That should be successful and you should have seen the configured AUTH mechanisms. Now try without transport layer security: telnet <your server IP address> 143 01 LOGIN user password That should be forbidden because of LOGINDISABLED. Regards Alexander