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OK, so sending works fine, but what I receive is from "Username@ComputerName.localhost", which clearly cannot be replied to. Is there an IP address linked to the email that can be used to respond? -- I'm guessing the sender information doesn't just disappear into the ether.
1I remember configuring an MX entry on my DNS because I thought it'd be cool to use my machine as a mail server. Well, almost immediately I started to get spammed by people attempting to log into my system as all kinds. Everyone wants to control a SPAM relay. I deleted the DNS entry in the end. – paddy – 2012-04-19T22:54:58.937
1Use
mail -r me@valid.domain.org
to set appropriate reply-address. – paddy – 2012-04-19T22:55:50.823@paddy Same here. Ah, those were the days! – George M – 2012-04-19T22:59:13.190