You might think that if you send an email with the delivery receipt option and the delivery receipt comes back, the email was delivered. But when an offeror submits a proposal by email, does a delivery receipt mean that the agency necessarily received the proposal in its inbox?
At least under the facts of one recent GAO bid protest, the answer was “no.” In that case, the GAO held that an email delivery receipt wasn’t sufficient to demonstrate that the agency received the electronic proposal.
SOURCE – READ THE FULL ARTICLE AT: http://smallgovcon.com/gaobidprotests/gao-email-delivery-receipt-didnt-confirm-proposal-submission/