Brad Fitzpatrick (brad) wrote,
Brad Fitzpatrick
brad

greylisting 4xx patterns

We're building a list of error messages as given out by greylisting email servers so we can pattern-match on it and re-schedule the email exactly when we're told it's okay to.

Here's the patterns we've seen so far:
451 Greylisting enabled, try again in 1 minutes                                                                                                                  
451 4.7.1 Greylisting in action, please come back in 00:09:00                                                                                                     
451 4.7.1 Greylisting in action, please come back later                                                                                                   
450 <xxx@xxx.com>: Recipient address rejected: Greylisted for 181 seconds
450 4.7.1 <xxx@xxx.com>: Recipient address rejected: Greylisted for 300 seconds (see http://isg.ee.ethz.ch/tools/postgrey/help/xxxxxx.html)
450 <livejournal.com[204.9.177.18]>: Client host rejected: Policy Rejection- GreyList learning. Please try later.
450 <xxx@xxx.com>: Recipient address rejected: Policy Rejection- Hotkey Greylisting in progress ... Please try again after 2 minutes
451 sender/recip/ip triad greylisted; retry AFTER A DECENT INTERVAL will succeed
450 <xxx@xxx.com>: Recipient address rejected: Greylisting in action. Please try delivery again in 240 seconds.
451 4.3.0 Temporarily greylisted as anti-spam measure.  Please try again.
451 <xxx@xxx.com>: Recipient address rejected: Service is greylisted.  Waiting for retransmit.
etc, etc.

Think I need to write a CPAN module just to return the number of seconds to retry given a string.
Tags: email, perl, tech
Subscribe
  • Post a new comment

    Error

    default userpic

    Your reply will be screened

    Your IP address will be recorded 

    When you submit the form an invisible reCAPTCHA check will be performed.
    You must follow the Privacy Policy and Google Terms of use.
  • 18 comments