[Mimedefang] Reject without PTR record

[dimon at intellinetinc.com]

Quoting Joseph Brennan <brennan at columbia.edu>:

> 
> > But I have another question (similar to first one):
> > Does it make sense to reject email if domain part of sender's address
> > doesn't  have A or MX records?
> 
> Sendmail temp fails that now.
> 
I'm sure it rejects it by default (at least the one installed from FreeBSD 
ports).

Is it better to reject or just to tempfail such emails?
As I think more about that, my choice is to tempfail, because the DNS server 
responsible for that domain might be down at this time.

Dmitry