What’s the most useful writer tip you’ve found from this post?

https://wordtothewise.com/2020/01/using-reply-to/

Yesterday I learned that some ESPs don’t support the reply to: address. I asked around to discover which ESPs did. Here’s what I learned.

ESPs that support reply-to:

ActiveCampaign
AmazonSES
ConstantContact
Cordial
Delivra
Eloqua
Emma
iContact
Listrak
Mailkit
Marketo
Responsys
Sailthru
SFMC
Sharpspring
Twilio / SendGrid
Zeta Global

Thanks to all the colleagues who answered my question.