Conditioned delivery of electronic mail

A method for conditional delivery of e-mail comprising:

• transmitting a first e-mail message to a first group of individuals, wherein the first group of individuals are associated with a plurality of first addresses;
• receiving one or more return receipts, the return receipts corresponding to a receipt status of said first e-mail message with respect to corresponding ones of said plurality of first addresses;
• determining, in response to said return receipts, if a first preselected set of conditions is satisfied, then a second e-mail message is delivered to a second group of individuals associated with a plurality of second addresses, wherein said first preselected set of conditions comprises a receipt of said first e-mail message by a first specified fraction of said plurality of first addresses, wherein said first preselected set of conditions further comprises display of said first e-mail message by a second specified fraction of said plurality of first addresses, wherein said first group of individuals are different from said second group of individuals.