mirror of
https://git.FreeBSD.org/ports.git
synced 2024-11-27 00:57:50 +00:00
18 lines
941 B
Plaintext
18 lines
941 B
Plaintext
Tarpits like spamd are fake SMTP servers, which accept connections but don't
|
|
deliver mail. Instead, they keep the connections open and reply very slowly.
|
|
If the peer is patient enough to actually complete the SMTP dialogue (which
|
|
will take ten minutes or more), the tarpit returns a 'temporary error' code
|
|
(4xx), which indicates that the mail could not be delivered successfully and
|
|
that the sender should keep the mail in his queue and retry again later. If
|
|
he does, the same procedure repeats. Until, after several attempts, wasting
|
|
both his queue space and socket handles for several days, he gives up. The
|
|
resources I have to waste to do this are minimal.
|
|
|
|
If the sender is badly configured, an uncooperative recipient might actually
|
|
delay his entire queue handling for several minutes each time he connects to
|
|
the tarpit. And many spammers use badly configured open relays
|
|
|
|
WWW: http://www.OpenBSD.org/spamd/
|
|
|
|
-Max <max@love2party.net>
|