Don Gillespie takes care of the DNS records for tighar.org.
https://manage.slicehost.com/zones/: log in with e-mail address and Slicehost password
Name Data Type tighar.org. 173.45.236.139 A www 173.45.236.139 A tighar.org. ns1.slicehost.net. NS tighar.org. ns2.slicehost.net. NS tighar.org. ns3.slicehost.net. NS Reverse DNS IP: 173.45.236.139
Slice name: tighar.org
Check the record from terminal: dig @ns1.slicehost.net tighar.org
Check from heaven knows where: dig tighar.org
http://articles.slicehost.com/2007/10/25/create-a-mail-exchange-mx-record
A record: mail MX record: tighar.org, mail.tighar.org, 0
Test results: dig @ns1.slicehost.net tighar.org MX
OpenSPF has a wizard for helping to create SPF records: http://www.openspf.org/
Use TXT in tighar.org records to create an SPF record.
“v=spf1 a mx ~all”