Ha, ha left out ther references in previous message,

Following sections of mentioned RFCs indicate that at least SASL for
POP3, SMTP and IMAP follow same scheme relative to the
'initial-response' being optional for each respective
authenticate-command.

POP3 SASL - rfc5034 (section 5) http://tools.ietf.org/html/rfc5034
SMTP SASL - rfc4954 (section 8) http://tools.ietf.org/html/rfc4954
IMAP SASL - rfc4959 (section 3) http://tools.ietf.org/html/rfc4959

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