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About Swaks is a featureful, flexible, scriptable, transaction-oriented SMTP test tool written and maintained by John Jetmore. It is free to use and licensed under the GNU GPLv2. Features include: SMTP extensions including TLS, authentication, pipelining, PROXY, PRDR, and XCLIENT Protocols including SMTP, ESMTP, and LMTP Transports including UNIX-domain sockets, internet-domain sockets (IPv4 and I