I suggest that when you respond to an email, the mod could use the Interleaved style response style instead the ugly Top posting.

Interleaved style is more aesthetic, allows you to respond to specific parts of the email and is mostly used in regular email (also in GitHub)

The Top posting style became fashionable because of Outlook/Gmail and it looks very ugly in a long message conversation

I don't know if it would be possible to give a nice format to the quotes with > when the message is displayed

I recommend this wikipedia article