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Originally Posted by zovat
The SMTP server does not care what "from" address you use, but will not allow you to go to another SMTP server directly.
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This is not true, some of the new SMTP servers do.
If your from address is incorrect, you will (or may) get an error 553 (as soon as the new servers are all rolled out you'll always get it).
Errors in the 55* category were designed to stop spammers.
If you are connected to ntl, then you will need to use the ntl smtp server, with a correct from address.
You will not (or at least shouldn't) be able to send to any other domain using an SMTP server that does not belong to your ISP (ruling out purchased/rented servers here).