nomail is a simple SMTP server that rejects connections immediately, in accordance with RFC5321.
It violates the standard in a few ways - these may get fixed if I can be bothered.
Assuming $GOPATH
is writable and $GOPATH/bin
is on your path
$ go get github.com/kuroneko/nomail .
$ hash -r
$ nomail
This will start the listener on port 8025. Redirect port 25 et al as appropriate.
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