Re: email lacks sender address

[Haines Brown <haines@histomat.net>]

On Wed, Apr 27, 2022 at 01:42:05PM +0100, Brian wrote:
> On Wed 27 Apr 2022 at 08:05:46 -0400, Haines Brown wrote:

> > If I understand correctly, which is always in serious doubt, it is 
> > exim that constructs the Sender: line by combining /etc/mailname and 
> > $LOCALHOST. Is this so?
> 
> No. exim4 uses what is in /etec/mailname as the MAI FROM: (the envelope
> from).

Thanks for the clarification. 

> > These values are present:
> > 
> >   $ nano /etec/mailname
> >   lenin.histomat.net
> 
> lenin.histomat.net appears to be unrouteable. How a remote system would
> deal with that is anyone's guess.

I do not understand. What should /etc/mailname look like? I suspect it 
should simply be histomat.net and wonder how the host name got in 
there. I changed it to the latter value but still get 5.5.1 Protocol 
error from online email tester. Perhaps I need to restart networking.