Issue 1: There are no line breaks in received mails. This alone makes it quite unusable.
Issue 2: First I thought it was a rights issue, but even after chmod 777 there is this following message each time one sends a mail:
Replace file
You need to overwrite your davemail.json file.
and select Save as…
Then replace the existing davemail.json file with this new one. This new file contains your new data.
This makes it even more unusable than the first issue.