Sender Score Reputation, Senderscore - SenderScore.org
https://www.senderscore.org/senderscore/ sendnder-score IP lookup tool
MultiRBL.valli.org - Blacklist, Whitelist and FCrDNS check tool
http://multirbl.valli.org/lookup/ search multiple DNSNL
[Gmail.com operator] (in comments for) A note for Hotmail users [LWN.net]
https://lwn.net/Articles/432813/ “jwb” – one of postmasters of gmail.com commenting on lwn
Out of Control® - » Sendmail pipe script dilemma
http://www.outofcontrol.ca/archives/2006/11/28/sendmail-pipe-php-script-dilemma/ sendmal “smrsh” (aka sendmail restricted shell) – how to do do “pipe to a script” alias.
Setting Mailbox Limits over 2GB
http://www.petri.co.il/setting_mailbox_limits_over_2gb.htm how to set mailbox storage limits over 2GB in exchange 2003
Email Blacklist Check - See if your server is blacklisted
http://www.mxtoolbox.com/blacklists.aspx website that does blacklist lookups.
Home :: Xuheki Webmail
http://www.xuheki.com/ new ajax imap webmail client
IMAP Tools [migrate]
http://www.athensfbc.com/imap_tools/ tools to copy and/or migrate imap mailboxes
Skiplist recovery - Science IT [recover Cyrus IMAP <mailbox>.seen database]
http://www.sit.auckland.ac.nz/Skiplist_recovery This note explains how you can recover corrupted skiplist databases used by cyrus to keep track of the mailbox status (eg READ/UNREAD email).
I Knew How To Validate An Email Address Until I Read The RFC
http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx notes about testing for valid email addr syntax