[issue5713] smtplib gets out of sync if server returns a 421 status

[R. David Murray]

R. David Murray added the comment:

Sure, a new issue for making sure smtplib conforms to 5321 would be good (we already did it for smptd; hopefully we didn't miss anything).

For the moment 5321 is the standard.  There's a new one coming, where utf-8 will be allowed, but we're not quite ready to tackle that yet (soon, though, hopefully).

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