Can't Send Emails With Mac OS X Mail?

Why can't I send emails through Mac OS X Mail when I'm using another internet connection (besides my main home connection)?
Thanks,
Mason

This is likely either because when at home you are using the SMTP provided by your ISP, and it is not separately Authenticated and thus blocked by the host ISP at the other venues, or you are using a third party SMTP successfully on Port 25 at home, but in the other venues, they are blocking third party SMTP on Port 25.
If the SMTP of your ISP, check to see if they have a version that can be authenticated for travel use -- many do.
If using another SMTP at home on Port 25, change to Port 587 which should work either at home or away.
More info, please, if this does not solve, including who your ISP is?
Ernie

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