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"A relay server initiates a TCP connection to the server on the "well-known port" for SMTP: port 25, or for connecting to an MSA, port 587. The main difference between an MTA and an MSA is that connecting to an MSA requires SMTP Authentication."
Misconfigured server that accepts mail unauthenticated on port 587?
@Alɘxɒndɘɿ #FCKAFD yes, I think so, but it seems to be quite common, we get a few abuse mails for this, so maybe we have to close the port at some point.
Port 443 is SMTP related (submission IIRC)?

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