I used this method to send an email at a backdated date/time.
So, when I send an email from another email ID (Address B) to myself (Address A), with an older date, it is showing up as an older email.
note: Both are gmail Ids
However, there are a couple of issues:
1. It is not showing up in the sent email of account B.
2. It is showing as via nick.cook.allsimple.net or mailed by nick.cook.allsimple.net. I don't want that to be showing.