Wladimir Mutel' <[EMAIL PROTECTED]> wrote: > Dear people, > > Could you please kindly advise me what is the recommended way to > implement greylisting in Courier ? I would prefer something > simple and easy, like Postgrey to Postfix. Are there any > analogues ?
Well, I can't say that it's the "recommended" way, but what I did was to use the Maildrop "rcptfilter" hook, and run a simple greylisting script written in Perl. The script implements a greylist using a DBM database, with a per-sender-address holdoff period and post-holdoff authorization period (global settings for both are in the script file). The greylist script is run as one of the last elements of the Maildrop rcptfilter script, after the blacklist and whitelist checks, DNSBL checks, reverse-DNS check, SPF validation, and so forth. This seems to work pretty well. The only quirk is probably inherent to greylisting - if I try to send an email to someone off-site, and their SMTP server implements an SMTP-time sender-address-verification (i.e. their server connects back to my MX and uses "RCPT TO" to verify my address), the outbound mail ends up being delayed. My server responds with a 4xx greylist message, and their server decides that it can't verify my address on my outgoing email and passes the 4xx back along. As long as my message delivery is retried during my greylist script's post-holdoff permission period, the mail does get delivered eventually. ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
