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Is it possible to limit outgoing emails to one domain?

A customer of mine has asked if we can set-up their email software at each shop, so that it can only send emails to one domain name. They are currently using Google Apps with Mozilla Thunderbird 3 ...
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1answer
2k views

Spoof sender through Gmail SMTP in Thunderbird

Gmail allows its users to send emails as though from another email address, as long as that address has been verified. Is doing so possible through Thunderbird and the Gmail SMTP servers?