SailMail is radio based e-mail system designed for boat owners operating beyond line-of-sight radio links to the internet.
Much of its underlying technology is built upon the Winlink software originally developed by amateur radio enthusiasts.
[1] Operation on SailMail network frequencies requires a PACTOR modem and an SSB radio.
[2][3] Sailmail operators do not need to hold an amateur radio license, as is the case for the similar Airmail product.
[4][5] As of December 2023 the annual membership cost was US $275.