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Greylisting issue

Started by madodel, 2007.05.20, 03:12:16

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madodel

Just to let you guys know, all the os2world.com addresses subscribed to the VOICE news list are coming back the past couple of days as "Recipient address rejected: User unknown in virtual mailbox table"  Unless you can white list the VOICE mail server I will have to unsubscribe these addresses.

Mark

kim

#1
Mark,

this is not a greylist issue, we actually deleted quite a few e-mails accounts that didn't respond to our earlier request if they wanted to keep their e-mail accounts or not. This is also what the error indicates User unknown in virtual mailbox table - the user account has been deleted and there is no mailbox to deliver to.

Also I think that it can't be that many .com addresses but rather .net, or?

madodel

#2
Kim,

OK I will unsubscribe them.  There were three, all os2world.com, one of which I thought was yours.

achimi-os2worldcom
jsmall-os2worldcom
kim-os2worldcom

Mark

Blonde Guy

The greylisting article was pretty cool, but how can I test it? I'm using Weasel -- will Weasel resend a message to your greylisting server? Can I set up greylisting on Weasel?
Expert Consulting for OS/2 and eComStation

kim

#4
Everything that comes in to the mail server has to pass by the greylisting feature, so if you haven't sent an e-mail to me, kimh at os2world dot com, the MTA (Postfix in our case) will say that it's for the moment a little bit busy and that what ever mailserver trying to connect has to try again later. So far so good, so when you once has been verified as trusted sender, your added to the greylist for 90 days. If you don't during this period communicate with the server, your e-mail is flushed out of the greylist.

Weasel shouldn't have any issue with this, go ahead and give it a spin and see what turns up in the log files from Weasel. I don't know if Weasel has greylisting feature but it might be a great suggestion for future enhancement (or bounty suggestion) since spam has increased. Read somewhere that spam takes up around 85-90% of all e-mails sent... bandwidth that someone has to pay for.

So far the only e-mails that we had to put on the whitelist was from Google for some of the various services that they have and that we use.

kim

Speaking of spam; hopefully after the arrest of Robert Alan Soloway; the spam flood might decrease íf we're lucky and the court puts him away for a while. But, then again, if there is a marked for this kind of crap, it might be just a matter of time before a new spamking is around.... a few lines can be found here.

chennecke

You should consider removing this article. Two reasons:


  • It has become ineffective. Spammers have already adapted to the technique and are sending spam several times automatically.
  • It increases e-mail traffice considerably.

kim

Well, making a claim that greylisting is ineffective would be on the same level claiming the spam filters are ineffective as well. Greylisting works fine in combination with spamfilters and antivirus and another reason for using greylisting is that it takes of quite a load of a mail server. Agree that e-mail traffic increases, but then again; we wouldn't have this problem if spam didn't exist. So the the choice of being able to avoid 200-300 spam mails per day or as now getting couple of spam per day in total on 12 different accounts; well I think it's an easy choice.

Here are the mail statistics; guess that it's clearly shows that greylisting works and as well spamfiltering would do the same works as well. But, when we in the start added spam and antivirus to filter incoming e-mail we noticed that the server was more or less on full load all the time and greylisting removed that load.