New answers tagged administration
Unfortunately, ssmtp does not read ~/.forward. Here is a quote from the ssmtp manpage. It does not do aliasing, which must be done either in the user agent or on the mailhub. Nor does it honor .forwards, which have to be done on the recieving host. It especially does not deliver to pipelines.
You say you are using SSH to manage "a few" boxes. I would highly recommend ClusterSSH for writing the same commands to all of them at once (assuming they have a similar purpose). http://www.linux.com/learn/tutorials/413853:managing-multiple-linux-servers-with-clusterssh Usage is as simple as "cssh -l username clustername", which will open many uxterm ...
What is the optimal way to handle this from my side? you have 2 ways Is adding these "special" hosts to mynetworks = my only option? No, it does Is perhaps my whole smtpd_helo_restrictions setup wrong in some significant way? no, it has a general restriction rules. The easiest way. You can skip checks for these host ...
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