Question is we have a SMTP relay setup for office 365 and its working great. We have valid SMTP address under whose credentials its using to relay the messages. Example is i have a printer@mydomain.com so it allows it to relay and send. Well the problem I'm having is that our phone system always sends the email as the caller ID info @ our domain example 5555551245@mydomain.com. How would i allow it relay?
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SMTP Relay from our phone system
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