Using the regular postal service as opposed to e-mail; suggesting that the service is as slow as a snail.

Etymology: Scott Adams, creator of Dilbert
(n) conventional mail in which a letter or package is physically delivered by a postal service, esp. when the object mailed could have been sent electronically via email/e-mail and arrived at the destination instantly

A popular phrase on the Internet for mail services provided by the U.S. Postal Service and similar agencies in other countries. The term has its origins in the fact that regular postal mail is slow compared with e-mail.

Tax funded delivery of trash to your apartment daily, except on Sundays and certain holidays, all year long.

something strongbad does in his weekly routine.

Postal service used in 1800s-1930s era that usually took a few months to transport mail

Snail mail is mail that is being sent from overseas bound for the United States