mass email won't work for suspended email account in database table

I have a member table in my database that contains member information including email. I built feature to send email to each member as newsletter. It works great, however, after some time, this feature throws error. After checking, I found some email address has been closed and no longer existing. When I send newsletter, when this type email account occur, it will stop send email to the rest members. the code is below. Any thought?
MemberSet.MemberDataTable membersDatatable = MembersDB.GetAllMembersAndDetails(); //go through memberTable and send each one the email for (int i = 0; i < membersDatatable.Count; i++) { //get specific group member's email for sending MemberSet.MemberRow memberRow = (MemberSet.MemberRow)membersDatatable.Rows[i]; //MemberSet.MemberRow members_memberRow = (MemberSet.MemberRow)membersDatatable.Rows[i] ...