[Mimedefang] Mail from Yahoo

[Kevin A. McGrail]

All I can really say is welcome to the world of dictionary attacks.  This is 
par for the course for most of I think on the list.

#1 things that help that come to mind

  using things like md_check_against_smtp_server or ldap checks

  using bad_rcpt_throttle with sendmail and a program that monitors for this 
and blocks them

  using helo and invalid sender tests

  configuring sendmail to drop people with pre-greeting traffic

Regards,
KAM


>    Anyone else seeing a lot of e-mail coming from different IPs, with 
> senders with yahoo addresses?  hugh at yahoo.com, alexander at yahoo.com, 
> walter at yahoo.com, simon at yahoo.com, john at yahoo.com, etc., etc.  Almost all 
> of them are sending to invalid/unknown recipients on my domains and 
> mimedefang does a wonderful job with md_check_against_smtp_server().  Just 
> wondering if anyone has noticed this on their servers as well...