Does SeaMonkey Composer support SFTP?
No, SeaMonkey Composer does not support SFTP as of release 1.1.9, released March 25, 2008. SeaMonkey Composer is bundled with the SeaMonkey Suite. The SeaMonkey Suite is the continuation of The Mozilla Application Suite. Read the FAQ answer “What do I do if my application does not support SFTP?” for other options.