Godaddy outgoing mail

One of our email accounts at godaddy suddenly would not accept outgoing email via port 25. Just like that. It may be our ISP or our Astaro and frankly it doesn't matter.
Godaddy also has ports 3535, and 80 open for SMTP.
I chose 3535 for that person who uses a laptop in the office and outside the office, in hotels and what have you. Port 25 is blocked left and right, and port 80 is well, I don't think so...