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Per the discussion in the comment thread, this requirement will be accepted as a requirement against CSSMTP, not SMTPD.
Are you asking for this retry interval setting to be provided for SMTP, or CSSMTP? SMTPD is no longer being enhanced and will no longer be part of the product after z/OS V2R2 (as covered by a couple of statements of direction).
If you are asking for this to be provided for the MaxMsgSent option in CSSMTP, that would seem to be a reasonable request, but I'd like to make sure that I understand the problem. Is the receiving server configured to block the sending IP address if it receives more than "n" emails across some specific period of time from a single IP address? So, you need the retry delay to spread the emails out over a long enough time period to avoid that?