How to detect forged From and Reply-to addresses from your own domain

[Anthony Cartmell]

> My ISP redirects all port 25 connects to its own servers so even if I
> know what I'm doing, I can't use your MTA for my outgoing mail for this
> account.

I always instruct that they use the proper message submission port, 587,  
for sending mail. This requires authentication so can be used from  
anywhere on the internet without needing to change the outgoing  
servername, and also works around any ISP that hijacks port 25.

Anthony
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