How to quiet or mute iOS 12 Mail Send sound?

Question

Same as this question, but iOS has changed.

The whoosh sound when Mail app sends a message is too loud. I've tried the volume down button while using Mail but it didn't change. I muted the receive notification sound already.

How do I change it?

Answer 1

Try going into Settings then Sounds & Haptics, then scroll down to Sent Mail and select None.