The best expression for "delivered personally" or "personally delivered", in particular, in the context of agreement, is "親展" in Japanese. I bet you have received envelopes on which "親展" is stamped.


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Note added at 2003-05-17 15:06:11 (GMT)
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英辞郎 gives a good rendition:

Any notices required under this Agreement must be given by personal delivery or by prepaid registered or certified mail with return receipt requested.
《契約書》本契約に基づいて要求するすべての通知は、親展もしくは前払いの書留航空便で送付し、受領証の返送を求めなければならない。