On 10/25/2010 10:38 PM, utahnix wrote: > Hello all, > > This question has probably been asked on this list before, but maybe not > quite with these circumstances. I'm hoping one of you can give me some > direction. > > I've got a fairly typical Postfix setup... Postfix, Cyrus IMAP, ClamAV, > SpamAssassin... all on Linux. > > Anyway, I've set up greylisting with Postgrey to help cut down on the > junk mail that I get. I've set it up with default values (deferral of > 300 seconds, etc). Well all seems good and fair except some of my > regular senders can't seem to get their email through. I've checked my > server logs and I don't even see their email address mentioned (it > doesn't appear to even reach my machine). Several of the emails in > question are Yahoo or Gmail. What's odd is that I have both a Yahoo > account and a Gmail account, and I can send myself mail with no problems. > > I disabled Postgrey temporarily and had these senders re-send test > messages from their addresses, and it worked (I got their messages). So > something was certainly hanging things up. I just wish I knew what that was.
Do you have "smtpd_delay_reject = yes" set? If so, you should be able to see the senders' addresses in your logs even if they were greylisted. > This got me thinking... my ISP requires that I forward all outbound > email through their SMTP server. Because their mail server (the SMTP > relay I'm required to relay mail to) has suddenly been added to various > RBLs for repeated "deferrals", is it possible that my greylisting is > what is getting them on those RBLs? Added to RBLs for deferrals? Doesn't make sense, or I'm missing something. > The Postgrey does cut down on the spam significantly, particularly when > used in conjunction with SpamAssassin and RBLs like SpamCop and > SpamHaus. I'd like to keep Postgrey if I can, assuming that my delivery > problems are not directly associated with Postgrey... but if my > circumstances with my ISP won't allow me to greylist, then disabling > Postgrey might save me a headache. > > I guess I'm looking for some advice as to whether Postgrey could cause > problems with my ISP (they run Exim on FreeBSD and firewall outgoing tcp > port 25 everywhere but on their one mail server) but I don't know much > more than that), or if there are some settings I should change to > improve my greylisting setup. It's highly unlikely, but concentrate on one problem at a time. When these people send to you and the messages don't make it through, do they get a rejection or anything that might suggest that delivery failed? If not -- while you should still be seeing their email address in the logs -- I would guess that SpamAssassin or ClamAV snatched the message. Now might be a good time to post your `postconf -n`.
