It just occurred for me and no, resending the email does not work.
This is the thread I'm trying to reply to and this is what I got 3d ago and now as well:
We're sorry, but your email message to ["discuss+1f2a66ede4c23843e7b27f6b218ee8fb@elastic.co"]
(titled Re: [Hadoop and Elasticsearch] Finding errors while inserting data into hbase throudh hive) didn't
work.
Basically it looks like the key provided in the email is not valid. Hopefully checking the records and potentially the email logs for this thread/user sheds some light.