Cannot Send Mail error message

Hey guys,
Having a few email issues. When I'm at home, using wifi, it receives and sends perfectly. However, when out of range, and using my telco's 3g etc connection, it receives messages fine, however when I'm sending the messages stay in outbox with a Cannot Send Mail - One of the recipent addresses was invalid message. The address is fine, and i've tried it with multiple addresses with the same messsage. Interesting, mail send with @"my isp" seem to work.
I've got the settings set up with my ISPs outgoing server, and also my Telco's SMTP server too - which I can't change any of the settings in anyway....
Any clues??

The first thing that jumps to mind is that while you're away from your ISP's connection, sometimes they require a different port to be used when sending. This isn't the case all the time but again, it's the first thing that came to mind.
Many ISP's require you to be connected directly to them when sending mail from their account. It's really a security measure on their end but most do offer an alternate port that you can change to which will allow you to send when out and about via 3G or another wifi connection, etc.
It's something to look into. I would contact them or look online for their advanced settings.
Regards,
Brian

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