Masquerading E-Mail-Addresses

Like many other organizations Graz University of Technology verifies if the sender (not the From:) address is replyable.

So you need to masquerade the sender addresses in some cases like PHP- or other webforms, which normaly use something like defaultname@hostname to send e-mails.

It depends on your MTA how to do this:


sendmail

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exim

In /etc/email-addresses you can define a sender address for local accounts:

$ su
# echo "myaccount: myaccount@some-reachable.domain" >> /etc/email-addresses

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Postfix

In Postfix you can fix it with masquerade_domains = …

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