sendmail relay?

Question

send mail

There is an external mail server SendMail (front.server.ru).
It sends mail to internal (back.server.ru).
But at the same time, when receiving a letter in the headers, it is added:
Recieved: from front.server.ru by back.server.ru
And it is necessary that the real address of the sender's host be displayed:
Recieved: from real.sender.ru by back.server.ru
I.e. you need to make SendMail transparent.
SendMail:
mailertable:
server.ru smtp:back.server.ru
relay-domains:
back.server.ru

Answer 1

if there is still silence here, then we can conclude that the inhabitants of Habr have long since thrown this ancient craft into a landfill. Personally, I did this at my first job. I know this is off topic, but in the absence of other advice, consider changing your mail server to something more common, such as exim or postfix.