Re: [exim] stupid hosts using bogus rcpt to

Daniel Tryba <d.tryba@???> wrote:
> On Wednesday 08 July 2015 17:38:55 Sven Hartge wrote:

>>> But incredibly stupid, how will the sender ever know its mail isn't
>>> getting delivered to the endpoints?

>> That's his problem then, not yours, isn't it?

> It becomes my problem if the recipient doesn't accept the mail (even with
> recipient verification a more strict filter may reject on the enduser MTA),
> then my relays get frozen messages in the queue. Enough of these will raise
> warning/alerts and the need to find out if there is a problem in my domain.

Ah, you don't store the mail locally but forward the mail to an external
system outside of your control.

Then, of course, you are between a rock and a hard place.

But as the others said, a callout to an external system to verify a
complete mail address is dangerous and will land you on multiple
automatated blacklists.

Verifing the existance of a domain via a DNS lookup is fine of course,
but checking the localpart is bad. Please don't do this.

Grüße,
Sven.

--
Sigmentation fault. Core dumped.