My ISP changed my IP address, on a box with ISPconfig, Apache, PHP, Drupal, PROftp and Postfix. I changed the IP in many places according to instructions in other forum posts. Everything else works, BUT, now Outlook on my laptop can't send messages thru the SMTP on my server. Did I miss a setting? Telnet to port 25 on laptop to the server connects. . . . Why aren't the messages flowing?