nanog mailing list archives
Re: Blocking mail from bad places
From: John Levine <johnl () iecc com>
Date: 4 Apr 2007 19:43:24 -0000
While its a pretty brute force approach, one method Iâm trying is to curtail the source of email. In otherwords, if smtp traffic comes from an unknown source it gets directed to a sendmail server that intentionally rejects the email message (550 with a informational message/url).
1) You send bounces from spammers to innocent people, whose addresses have been forged.
This is an SMTP reject, not a bounce. It's a lethal variety of greylisting. This technique works great to keep spam out of your mailbox.
3) You are dropping valid emails.
Right. It also quite an effective way to be sure you never hear from non-technical users who don't understand your bounce message, and from people like me who don't feel like jumping through your hoops, particularly in a case like this where we're responding to a question you asked. R's, John
Current thread:
- Re: Blocking mail from bad places Scott Weeks (Apr 03)
- RE: Blocking mail from bad places michael.dillon (Apr 03)
- <Possible follow-ups>
- RE: Blocking mail from bad places Scott Weeks (Apr 03)
- Re: Blocking mail from bad places Valdis . Kletnieks (Apr 03)
- Re: Blocking mail from bad places Thomas Leavitt (Apr 03)
- Re: Blocking mail from bad places Ken Simpson (Apr 04)
- Re: Blocking mail from bad places joej (Apr 04)
- Re: Blocking mail from bad places Peter Dambier (Apr 04)
- Re: Blocking mail from bad places John Levine (Apr 04)
- Re: Blocking mail from bad places Ken Simpson (Apr 04)
- Re: Blocking mail from bad places John L (Apr 04)
- Re: Blocking mail from bad places Steven Champeon (Apr 04)
- Re: Blocking mail from bad places Thomas Leavitt (Apr 05)
- Re: Blocking mail from bad places James R. Cutler (Apr 05)
- Message not available
- Re: Blocking mail from bad places James R. Cutler (Apr 05)
- Re: Blocking mail from bad places Ken Simpson (Apr 05)
- Re: Blocking mail from bad places Matthew Black (Apr 05)
- Re: Blocking mail from bad places Valdis . Kletnieks (Apr 03)
- Re: Blocking mail from bad places Thomas Leavitt (Apr 07)
- Re: Blocking mail from bad places Valdis . Kletnieks (Apr 07)