> > I've observed some insane behavior by several MTAs that, when > > anvilled, will, rather than backing off and re-trying some interval > later, > > re-try immediately, at 10 to 20 TCP connects per SECOND, for 1000s and > > 1000s of connections. > > > > Some of these seems to be web apps (rather than real MTAs) that are > only an > > SMTP client running in a tight loop. > >Perhaps its some form of auto-DoS to try & get back at people using the >anvil feature.
If it is, they probably hurt themselves much more than they hurt postfix. postfix overhead in anvil rejections is extremely low, and a postfix smtpd process that anvil rejects for is liberated instantly. Len
