Well we finished counting the absentee ballots today in #AD24. After going through 1400 or so preliminarily invalidated ballots here is what I observed and some suggestions for @BOENYC to consider for the future:
The most frequent basis for invalidation was a missing signature on the ballot envelopes. So many people forgot to sign! This is a design issue that needs to be looked at for the future. Putting a giant arrow
where folks need to sign should be considered

Many people did not place the ballot in the ballot envelope instead placing a signed ballot envelope separate from the ballot in the mailing envelope. The ballot envelope was not big enough. It’s a struggle to get the ballot in and I can only imagine the difficulties for elderly.
Many ballot envelopes were not sealed. Perhaps in the middle of a pandemic people are less inclined to lick the envelope. A self adhesive envelope may help here.
Untimely post marks (after 6/23) was another frequent reason for invalidation. Someone even wrote on their envelope that they didnt receive the ballot until 6/23 and it was post marked 6/24. Lets just get rid of the postmark requirement and have a cut off date like 6/30.