This excerpt taken from the ISIS 8-K filed Jun 4, 2009.
Affidavit of Mailing. An affidavit of mailing, executed by a duly authorized and competent employee of the corporation, its transfer agent or another agent appointed with respect to the class of stock affected, specifying the name and address or the names and addresses of the stockholder or stockholders, or director or directors, to whom any such notice or notices was or were given, and the time and method of giving the same, shall in the absence of fraud, be prima facie evidence of the facts therein contained. (Del. Code Ann., tit. 8, Section 222)