There should be a way to resend or reissue autoresponders.  It has happened several times where I have been contacted by a registrant to an event who didn't receive confirmation of registration, or other autoresponders (either it went to a SPAM folder and was lost, or they accidentally deleted, or changed their email, etc).  They contact me as an administrator looking for another copy of that email, and I have no way of generating them one.  It's would be great to go into their constituent record, see a listing of all the autoresponders they have been sent, (and/or that they could have been sent), and click a button to have it resent to their current email in the constituent record.