Notification emails are showing a lot of "noise" around the content, while the content itself is not very visible. It would be nice to improve that.
The newly written content - which I think is the most important part - is shown dimmed (dark gray on light gray) and much smaller than the title and colorful icons.
It would be nice to improve the signal to noise ratio by increasing the visibility of "new" content, i.e. the newly written comment and reducing the visibility of repeated content i.e. title, "New comment", etc.
I wouldn't mind having only the comment as text and the name of the author below and a link to the ticket (as text too and not as a colorful button) at the bottom of the mail.