* Sander Smeenk (ssmeenk@???) [030925 13:16]:
> Quoting WJCarpenter (bill-exim@???):
> > 1. Does any part of Exim actually depend on there being a
> > "mailer-daemon" address? (I doubted it. It certainly doesn't appear
> > in my config file. OTOH, I did find this in the exim 3.36 binary I
> > built: "From: Mail Delivery System <Mailer-Daemon@%s>".)
>
> Did you read RFC's about this issue? For as far as I can tell my Exim
> 4.20 also emails bounces with headers containing 'Mailer-Daemon@' as
> the From: address.
>
> > 2. Does anyone know of any other harmful side-effects that might
> > surprise me if I get rid of that alias?
>
> You want to block mail comming TO that alias, not comming FROM that
> address, in that case, i'd say you're quite safe disabling it. But to be
> RFC compliant, i'd check the RFC's before doing so.
When a bounce message gets sent to a real person coming from
mailer-daemon, that real person may choose to reply to that message and
expect to speak to the postmaster. Also, say the bounce was being
delivered to a host that did callout sender verification. Then it
wouldn't accept it, since mailer-daemon@yourdomain is an invalid sender,
and the bounce message would be frozen in your queue.
If you're sending mail from mailer-daemon, you are asserting that it is
valid, and should be prepared to receive mail there as well. I'd advise
against removing this alias unless you also change exim to send bounce
messages from a different address (postmaster?)
good times,
Vineet
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