What is an appropriate link for IceDove?...

[Robert J. Hansen]

>> "Before configuring GnuPG though, you'll need the IceDove desktop email program installed on your computer."

http://www.getthunderbird.com

Mozilla's Thunderbird email client is free and open-source software.
However, Debian requires that software also be free of trademarks, and
Mozilla and Thunderbird are both trademarks.  So they take Thunderbird,
remove the trademarks, and rebrand it as Icedove.