@William_D Did you previously resend the affected email to newly added contacts on the date specified in the Resend-to-Non-Openers failure pop-up -- I never received a failure pop-up and never received a confirmation of the resend. We did not add new contacts between the two sends. or at any other point, prior to selecting the RSNO option? - Around the time of the resent, CC site said my chosen resend time was invalid but when I tried to resend with a 'valid' date/time it said the message was already resent. Did you originally have the email setup for RSNO while initially scheduling it to sendout, or have you only attempted RSNO after the email was sent? Originally set up RSNO at initial campaign scheduling.
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