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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."
https://en.m.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol
 
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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