Quote:
Originally Posted by ken0042
The idea being that I would be using their system to send the mail. For example my new house came with a year of Shaw internet, but I kept my Telus address. So I set my own Outlook to send from mail.shaw.ca and never had an issue.
The challenge here is that I have no idea who's network my uncle would be on. Could be Bell, Telus, Rogers, or something else.
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Yes, and you used the Shaw IMAP or POP settings to do this right? This is because you need to authenticate. There's no way any legitimate mail server in the world will allow open SMTP relay. To hook into their mail servers, you need to use the protocols and ports that they allow and this is very specifically usually IMAP & POP via the credentials you have with that ISP for the given email addresses. The other option is mail forwarding.
If you don't know what your uncle is using, just check the domain on the emails he is sending and check the MX record on it.