using procmail with mdbox in dovecot (deliver or dovecot-lda)

When using an mdbox or maildir mailbox, you need to use the dovecot-lda to deliver the message and not allow procmail to do this directly. I had a few issues getting this to work properly, here are the details of getting it going.

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using exim to filter aliases with #exim filter

Our aliases are spammed like any other account, but filtering on them would require making a real account. I wanted to be able to filter aliases without creating accounts for everything. My first solution was to create an account and filter on that one, then using $original_local_part I could forward to a filtered alias. This works but if someone discovers the filtered alias, they can bypass the filtering.

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gnarwl vacation queryfilter with vacationStart and vacationEnd times checked

We are using gnarwl for vacation notification and I would like gnarwl to only reply if the current time is in the vacationStart vacationEnd window.

Here is the queryfilter to do that using the following information:

$recepient - receiver of the message
$time - current time in seconds since the epoch

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