Editor: Snail Mail is an envelope addressing and printing application which interacts directly with The Address Book database in Mac OS X.
Its primary function is to quickly address and print single or multiple envelopes based on entries in the Mac OS X Address Book database, but it also allows ad-hoc manual entry of addresses directly onto the envelope.
Batches of envelopes can be based on Address Book groups, or ad-hoc selections of addresses. Snail Mail can print USPS barcodes for more efficient mail handling. Snail Mail provides for different default text attributes (font, colour, etc) for different parts of the address.
Snail Mail also includes a Plugin for Mac OS X's Address Book applications so that you can choose to print Snail Mail envelopes directly from the Address Book.
NB: Snail Mail is no longer being updated or supported (as of 26th June, 2009), and is looking for another developer to take it over. However, you can still download the last version of Snail Mail by clicking 'Download', below.