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Re:What does /etc/mailname do? by rstuart4133 on Wednesday February 12, 2020 @01:27AM (#22306405)
It's described pretty well here: https://wiki.debian.org/EtcMailName

On Debian update-exim4.conf writes whatever is in there into exim4 configuration files it builds in /etc/exim4. I have no idea why they do that - exim4 could just as happily read it from that file every time it needs it.

Re:What does /etc/mailname do? by cs101 on Wednesday February 12, 2020 @01:37AM (#22306447)
Isn't this link same as OP?