Sometimes there are some ISP's were seriously attacked by spammers on their SMTP servers. Spammers are very bad for a SMTP server where it can utilized 100% of it capabilities and it resources.
In some worst attacks the SMTP server just can't handle it any more and all it's services just stopped because of the mail processing. This is why some ISP's change their outgoing SMTP port for security and minimized chances being hit. The standard port is 25, so this port should be change to another port number.
Below is a video on how to change Microsoft outlook outgoing port;
if you can't view the video, please click here
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