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fakemtpd is a simple tool that emulates a modern SMTP daemon. It accepts connections and contains a valid implementation of the SMTP protocol as specified in and


Run fakemtpd with no arguments to start a default server. To see the default configuration, run fakemtpd --gen-config. You can change any of these parameters and write them to a YAML file, and then run fakemtpd -c /path/to/config.yaml. Many of the configuration parameters can also be overridden at the command line; run fakemtpd --help to see which ones.


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This work is available under the ISC (OpenBSD) license. The full contents of this license are available as LICENSE

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