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

[Terry J. Reedy]

Terry J. Reedy added the comment:

Given that David is usually more conservative about calling things bugs than I am, knows more about this subject than me, and has explained that the change will make smptlib act more sanely in the face of external errors, I am reversing myself and agreeing with him.

The patch seems to tighten the test in a way relevant to the code change.

I see that there are several open smptlib issues.
Should we open one for 'update to rfc 5321'?
Does the absence of 'obsoleted by' (or similar) mean that it is still the latest?

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stage: test needed -> patch review
type: enhancement -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5713>
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