I am trying to allow some external users the ability to use our SMTP machine in order to send emails out that appear like they come from us - as they are supposed to. If I set up outgoing SMTP authentication then they can logon to the SMTP proxy and into my internal SMTP server fine BUT all mail going to external SMTP servers gets authentication failures. So I want SMTP authentication when the SMTP proxy is trying to relay email through my SMTP server, but NO authentication as the email server is sending out to the real world.
Does this make sense?
The alternative is to turn off SMTP authentication on the SMTP machine and I'm a bit leary of doing that.
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