RFC 4865, "SMTP Submission Service Extension for Future Message Release", May 2007Source of RFC: IETF - NON WORKING GROUP
See Also: RFC 4865 w/ inline errata
Errata ID: 2040
Publication Format(s) : TEXT
Reported By: Arnt Gulbrandsen
Date Reported: 2010-02-11
Verifier Name: Alexey Melnikov
Date Verified: 2010-02-15
Section 3 says:
4) One required parameter, the hold-param, is added to the MAIL command using either the keyword "HOLDFOR" or the keyword "HOLDUNTIL". [...] Using ABNF [n2], the syntax of this parameter is as follows: future-release-interval = future-release-integer future-release-date-time = Internet-style-date-time-UTC
It should say:
The last quoted ABNF production should be: future-release-date-time = date-time ; <date-time> defined in Section 5.6 of RFC 3339
The ABNF contains a dangling production. An early draft shows that the RFC 3339 production date-time is what's intended (as Ned Freed found out).
The RFC also has no examples. I have a working server implementation of this, so without examples I guess talking to my server is second best. Send me mail in case of interest.