Milter-greylist

Michael Mansour wrote:
> Hi,
> 
> Some legitimate emails get greylisted for 90 hours and more, and I'm trying to
> understand why.
> 
> What cases would cause such very very long greylisting?
> 
> I frequently (a few times a day) also see greylisting of emails for 7 hrs and
> a little more, and looking at logs I can't understand why.
> 
> So I'm also wondering, what analysis / trouble-shooting should I be performing
> to determine why such lengthy delays occur? and what can I do to "fix" such
> issues other than whitelisting the sending domain.

  Since you have no control over the retry time used by the sender,
your only option to speed up the delivery is to whitelist at your
side of the connection.  This is especially true for those broken
mail servers that don't retry at all.