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Re: [ietf-smtp] SMTP Greylisting Retry Hints + PRDR

2019-02-07 11:33:24
On 07/02/2019 17:14, Dilyan Palauzov wrote:
imagine a mail with an empty Subject: for two recipients.  The first recipient 
does not want to receive emails without subject, the second recipient has no 
problem with this.

This is what happens at SMTP level:

250 blah blah
MAIL FROM:<me(_at_)example(_dot_)org>
250 OK
RCPT TO:<one(_at_)example(_dot_)com>
250 Okay
RCPT TO:<two(_at_)example(_dot_)com>
421 Retry soon retry=00:00:00
From: me(_at_)example(_dot_)org
Message-Id: 12a
To: one(_at_)example(_dot_)com, two(_at_)example(_dot_)com
550  You forgot to fill the Subject!

How would the server know to give the two different responses to the RCPT TO?

Or does it just always temporarily reject any messages for 'two(_at_)example(_dot_)com', just in case?


Paul Smith Computer Services
Tel: 01484 855800
Vat No: GB 685 6987 53

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