exchange 2007

[jlego]

apologize if this is the wrong section for this post..

setting up security / spam measures for an exchange 2007 server
my check list is as follows currently:

1) mcafee mxlogic 'cloud' anti-spam functionality for incoming message.
2) antivirus on each computer in company
3) antivirus on exchange and DNS servers
4) setup SPF record
5) setup DKIM
6) setup domainkey
7) setup senderID
8) submit spf to microsoft, yahoo, etc. for 'whitelist' purposes.
9) configure size limits for messages in exchange to safe numbers
10) i have 2 outside IPs for my email server, incase one gets blacklisted, switch to the backup.
11) my internet site rests on a different ip than the mail server
12) all mass emails for company sent through 3rd party company (listtrak.com)
13) setup domain alias, media, enews, and bounce for the 3rd party mass mail software.
14) verify the setup using [e-mail]
15) configure group policy and our opendns.org account to prevent unwanted actions and website viewing

does anyone know of anything else i need to double check or setup on my network to ensure proper mail handling strategies..

thanks