[5] It is portable enough to compile and run under Linux,[2] OS X,[2] BSD, Solaris, Cygwin and perhaps other Unix-like operating systems.
[5][1][2] This program offers features for sending email via SMTP.
[5] It supports SMTP AUTH (via the LOGIN and PLAIN mechanisms), MIME attachments, an address book, encryption of both transport (via TLS) and message (via PGP), and digital signatures (via PGP).
[5][2] It can be easily used for sending email from the command line, or via shell scripts or other software packages.
[5][6] The lack of modern features helps Cleancode eMail stand out as a fast, efficient and helpful tool for system administrators in Unix-like environments, as that was its intentional purpose when first developed.