Hi David,
Not legacy but potentially incorrect ... depending!!
In times gone by, irrespective of the domain of the FROM address, one tended to use the SMTP (relay) server on the network one was connected to without the need to authenticate with the server on port 25. When the vast majority of users were only ever connected to the same network access point, that was not too much of an issue. Then we became mobile and found that we needed to change the SMTP server every time we changed networks!!!
To address that we moved to requiring authenticated connections and were still able to send from any address.
Then people sought to abuse email, so many network providers blocked general access to port 25 on external servers and email submission (as opposed to relay) moved to the correct port 587.
That still left the issue that people can fake being someone@anywhere.com and send such emails via smtp.somewhereelse.com - such has been mitigated by the implementation of SPF
SPF effectively states that emails from @anywhere.com should only be sent via smtp.anywhere.com so that if the RECEIVER sees such emails coming from @somewhereelse.com THEY can consider it to be SPAM it THEY chose to do so.
Hence my questions - if was not clear what address you were trying to send from via which SMTP server to what address. In the SPF world, the question of "Has this FROM come via the correct SMTP sever to this RECEIVER?" is dealt with in the receiver's domain.
HTH and makes sense?
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