In trying to send mail to an alioth ml I got:

The following message to <[EMAIL PROTECTED]> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-"Verification failed for <[EMAIL 
PROTECTED]>\nCalled:   207.44.202.99\nSent:     RCPT TO:<[EMAIL 
PROTECTED]>\nResponse: 550 5.1.1 <[EMAIL PROTECTED]>... User unknown\nSender 
callout failed: Sender adress can't be verified trough SMTP check."

Shouldn't such tests cause, at most, mail to be queued up for
moderation? There probably are many users who are in no position to do
anything about sender verification failures[1], and this can efectively
cut them out from communication with many Debian projects.

[1] Me, for one. My home ISP demands I only send mail through their
SMTP relay.

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