Context
In previous versions of Mail one could see the size of an email in Apple Mail.
Question
Is it possible to recover this feature in Apple Mail 13.4 (MacOs Catalina)?
It seems that knowing the size of your email is useful, if only to avoid sending too large attachments?
Alternatively, how does one have access to the size of a given email?
Best Answer
Thanks to @jaume, the solution is in fact fairly trivial:
will display the size of each message.
I hope this post will be useful to someone like me who did not look at the correct place for the answer.