On 2021-11-04 11:20, Viktor Dukhovni wrote:
# Presumably this is internal only, and never butchers external
# envelope sender addresses. Perhaps mention why it is OK to lop
# off the parent domain suffix of the original sender domain...
In a typical Linux configuration where you have a local postfix
configuration sending to corporate relay server, a standard
configuration would yield a sender address of u...@hostname.some.domain.
In many cases, the domain, hostname.some.domain, is not an internet
resolvable domain, and mail servers tend to reject such addresses. In
my situation, I want to know were a particular email originates, which
is why I want to use user+hostname as the name/user portion, and then I
want to put a real domain on the suffix so the mail servers will not
reject email. This for legitimate reasons and not to be slick or evil.
It is to get mail delivered out of or environment to customer, but be
able to know where said email came from. So if I have thousands of
servers in a cluster all with the same account that sends email, I would
like to know what server that email came from.
