Mail Stats

A brief explanation of the terms used in the stats tables:

Received	Emails received and accepted for delivery
Delivered	Emails delivered (an email accepted may result in more than one remote delivery)
Recipients	Total of recipients (one remote delivery may be for more than one recipient)
Rejects	rejected emails
Connection lost	some servers drop their connection without completing delivery. These aren't strictly rejections, but may occur because the remote server is faulty.
All blacklists	We subscribe to some blacklists of IP addresses
spamhaus.org	...This is the first blacklist that we check
mail-abuse.com	...the second
dsbl.org	...third
ordb.org	...and fourth
HELO string	The first thing a remote server does is say what it's host name is
spoofing Sussex	sometimes they say they're Sussex servers!
invalid syntax	...others use totally invalid host names!
MSA enforcement	We don't permit remote servers to send mail from Sussex addresses
(general Sussex spoofing)	...but, generally we've already rejected the message for some other reason
Sender verify	We check the sender address is a real address with a callout to the MX server of the sender domain
fail	...some spam comes from addresses that don't exist
defer	...or can't currently be verified
Unknown user	Often spam is addressed to fictional addresses
Unrouteable addr	...more fictional addresses
Anti virus	Some spam contains malware
phish	...phishing attempts
worm	...worms
trojan	...trojans
zip file	...a few large or faulty zip files can't be inspected