Mail not sending while traveling

When I travel with my powerbook and use mac mail, none of my outgoing servers work. Shouldn't my me.com account work anywhere my mail works? Also, my comcast acct doesn't work, but it's a secondary account, so not as important as my 'me' account.
I've had to resort to logging in to my me.com account on the internet, and sending mail from there. It works, but it's not how I want things to operate.
Is there something I don't know about my outgoing mail servers? Why would they not work from anywhere but home?
Thanks
Bruce

Hi Bruce,
It generally boils down to the fact that ISPs generally won't pass through email sending unless it uses the right Ports & Authentication.
SMTP and SMTP-SSL is on ports 25, 587 and 465. Port 587 has to be SSL, and port 465 is enforced TLS-wrapped and is generally used by Outlook users.

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