README.md: Use IPv4 notation for localhost (#771)
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@@ -104,7 +104,7 @@ match mailer.send(&email) {
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## Testing
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The `lettre` tests require an open mail server listening locally on port 2525 and the `sendmail` command. If you have python installed
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such a server can be launched with `python -m smtpd -n -c DebuggingServer localhost:2525`
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such a server can be launched with `python -m smtpd -n -c DebuggingServer 127.0.0.1:2525`
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Alternatively only unit tests can be run by doing `cargo test --lib`.
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