This is valid for Outlook, Android, iOS, Thunderbird

Please enter in your Mailprogram the following informations:

Incoming Server:

server name: mail.MYDOMAIN.com
username: my@emailadress.com
password: mypassword
STARTTLS
Port: 143

Outgoing Mail Server:

server name: mail.MYDOMAIN.com
port: 587
Mailserver requires authentication: YES
Use STARTTLS
username: my@emailadress.com
password: mypassword
If it is not possible to send emails, because you cannot connect to the server, please try instead of port 587 port 465

Server: your domainname

username: Username from ispconfig
password: Password from ispconfig