REPUTATION
www.trustedsource.org – reputation and volume
www.senderbase.org – reputation and volume
www.sendmail.com/sm/resources/tools/ip_reputation/

BLACKLISTS & DNS
www.mxtoolbox.com – test for blacklists
www.dnsreport.com – test DNS configuration for domain

OPEN RELAY
www.abuse.net/relay.htmlwww.spamhelp.org/shopenrelay/shopenrelaytest.phpwww.antispam-ufrj.pads.ufrj.br/cgi-bin/test-relay.cgi?host_to_test=74.52.179.66

REVERSE-LOOKUP
http://www.zoneedit.com/lookup.html

SENDING TO HOTMAIL
http://www.isipp.com/wiki/deliverability/index.php/Main/Hotmail

COMCAST
http://postmaster.comcast.net/

AT&T
abuse_rbl@abuse-att.nethttp://worldnet.att.net/general-info/mail_info/block_admin.html

EXCELLENT testing resource
http://deliverability.com/resources/emailAuthentication.php

SPF information
www.seoconsultants.com/tools/spf/www.openspf.orghttp://www.kitterman.com/spf/validate.htmlMicrosoft

SenderID wizard
http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/default.aspx

SE sample SPF record: v=spf1 ip4:65.168.94.6 ip4:209.196.5.140 ip4:209.196.5.170 ip4:216.9.248.0/24 ~allthe first ip4 address is exchange serverthe second ip4 address is bomgarthe third ip4 address is kayakothe fourth range is blackberry / RIM ==> all of those servers are marked as allowed to send outbound on behalf of SE

Microsoft SenderID===========================
http://postmaster.live.com/snds

Add an SPF record to DNS and then email senderid@microsoft.com telling them that it’s done, including the IP address and hostname in the message. It will take some back and forth, but you should then be able to send to Hotmail users again – this process may take as long as a week.