The following is from the WM7D web site.

To access the callsign database via email, send a message to lookup AT 
wm7d.net.
The following shows an example:
To: lookup AT wm7d.net
Subject: callsign lookup <- this is important. Otherwise the spam filter 
will reject
your query
Message:
lookup wm7d
lookup w6ro
label wm7d
label w6ro
Keywords are lookup and label
. Lookup returns data from a regular callsign lookup. Label returns the data 
in a
mailing label format you can cut and paste into a word processor.
For more information, send a message to lookup AT wm7d.net, with help in the 
body
of the message.
NOTE: Do not send your request in HTML format.


Bob Tinney, K8LR, [log in to unmask]
Skype, bobtinn
Life is full of challenges, that's what makes it interesting!

----- Original Message ----- 
From: "Gary Tillinghast" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 06, 2010 10:13 PM
Subject: Callsigns via Email


Hi all,  Found out tonight that the web site of wm7d.net will do callsign
lookups via email.  You need to put in the subject line: callsign lookup
and put the call sign in the body of the text.  Gary KB2YAA