Choose IMAP account, not POP3 or HTTP.
Incoming server: mail.yourdomain.com port 143
Outoing server: mail.yourdomain.com port 26
Check the box 'My outgoing server requires authentication.'
Choose IMAP account, not POP3 or HTTP.
Incoming server: mail.yourdomain.com port 143
Outoing server: mail.yourdomain.com port 26
Check the box 'My outgoing server requires authentication.'