[exim] Re: Rejecting connections that have only IP as sender…

> Dňa 28. mája 2023 9:35:07 UTC používateľ AC via Exim-users <exim-users@???> napísal:
> 
>> Thanks, I already did check localhost but it appears what I was after was actually sender_host_name being empty which, from what I understand, is what H=([ip]) actually represents in the logs (if that's not the case hopefully someone can correct me).
> 
> There are two names of remote client, the one used in EHLO
> SMTP command and one from IPs PTR record.
> 
> The EHLO name is shown in log only if it differs from (confirmed)
> PTR name
> 
> The PTR name is in log only if that name's IP matches client's
> IP (is confirmed) and exim is configured to obtain that PTR
> name (i do it on MTA but don't do it on MSA).
> 
> Thus full host entry in log has format (if EHLO & PTR names
> differs)
> 
>      H=ptr_name (ehlo_name) [client_ip]
> 
> The log entry "H=([ip]) ..." means, that here is not (confirmed)
> PTR name and client used IP literal in EHLO name. It is expected
> on MSA (from users), but AFAIK has not be used by MTA
> nowadays (i do not accept it). Address literal is basically
> IP (with prefix for IPv6) enclosed in squared brackets, thus
> simple ${sg} regex can detect it...
> 
> These squared brackets can be confusing, as real IP is
> enclosed in them in logs too, but notice the "normal" brackets,
> which encloses EHLO name...
> 
> Check docs for appropriate variables for these names and
> related settings, they are on multiple different places.
> 
> regards
> 
>