[Exim] theoretical(?) question on etrn

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Szerző: Tamas TEVESZ
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Címzett: exim-users
Tárgy: [Exim] theoretical(?) question on etrn
hi,

this is a repost of the epiloque of my answer to marcus' etrn question
- incidentally i managed to format it such that it's not obvios (on a
25-line terminal here, at least) that the mail didn't end. i think
noone really noticed it (imho this is a topic someone would have
reacted to if it'd been noticed:)), hence this repost; deep apologies
if it bothers anyone.

** begins here **

actually there's something in etrn that bothers me. being able to
connect to an smtp server and having access to the ETRN command, i can
start a queue run to any domain i wish to. isn't that bad ? i mean, if
there are lots of mails, and the mxes for that domain are not
available, this will eat mtas resources; and this also raises a
question (be this exim-specific; i have a domain "on hold". someone
issues an etrn to that domain; this invokes exim -Rf (anything else
to try to achieve this functionality?); and this forces
the delivery.

this is ok, if i'm the one who is supposed to ask for my mails. but if
i'm just playing abusive, how will this affect the further handling of
these messages ? will those that are already in the queue be held
until the next ETRN (the ones that will arrive later will be held,
that's clear), or does a one-time -Rf cease the effect of
hold_domains ? (the latter can give a lot of opportunity to be
abusive)


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