Folks,
Here are some summary statistics from before and after I started
using a secondary MX filtered by qpsmtpd. I have only been able to
identify less than 10 pieces of mail that made it past qpsmtpd and
spamassassin (I discard above 20 on the spamassassin score) in the
two weeks I've been running on the new set up. All of the messages
that made it through were subsequently identified as spam by a human.
Test mail directed specifically at the secondary MX does get
delivered to its appropriate mailbox.
Before (single MX record):
Summary of file: 2005-12-29.log
Generated Fri Dec 30 04:09:11 2005
--- Statistics ---
Outgoing SMTP: 26
Outgoing Recipients: 30
Outgoing bytes: 1,699,402
Incoming SMTP: 51,156
Incoming Recipients: 37,361
Messages accepted: 14,738
Bytes accepted: 57,324,450
Localhost SMTPI: 2
Blacklisted Spams: 20,287
Hosts Rejected: 107
Relays Rejected: 1
Total Bytes Xfrd: 59,023,852
--- Blacklist Hits ---
CGP: 5835
relays.ordb.org: 19
sbl-xbl.spamhaus.org: 14432
After (2 MX records):
Summary of file: 2006-01-14.log
Generated Sun Jan 15 04:15:42 2006
--- Statistics ---
Outgoing SMTP: 14
Outgoing Recipients: 15
Outgoing bytes: 34,086
Incoming SMTP: 25,018
Incoming Recipients: 18,624
Messages accepted: 10,098
Bytes accepted: 48,023,166
Localhost SMTPI: 193
Blacklisted Spams: 5,412
Hosts Rejected: 107
Relays Rejected: 1
Total Bytes Xfrd: 48,057,252
--- Blacklist Hits ---
CGP: 1953
relays.ordb.org: 8
sbl-xbl.spamhaus.org: 3451
What I find really amazing is that the number of connection attempts
(Incoming SMTP) was roughly cut in half by having a secondary MX
(Before: 51,156; After: 25,018). In the Blacklist Hits, CGP is the
number of connection attempts killed by rDNS and SPF by Communigate Pro.
Andrew
P.S. I know I still owe you guys some documentation. I haven't
forgotten you.
____________________________________
Andrew W. Donoho
[EMAIL PROTECTED], PGP Key ID: 0x81D0F250
+1 (512) 453-6652 (o), +1 (512) 750-7596 (m)
"To take no detours from the high road of reason and social
responsibility."
-- Marcus Aurelius
