ASCII formatting for plain text email

[Pierre Willaime <pierre.willaime@univ-lorraine.fr>]

Hi,

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Warning: I hope you will forgive me for this email not really related to
debian. I just think people from this community could likely have good
advice about this question.
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I would like to format plain text emails to increase readability and
information separation. The idea is to go beyond markdown and to have
more visible elements. For example I am looking for a convenient way to
"draw" some ASCII boxes such as

#####################
## some title here ##
#####################

(I am using emacs comment-box feature in a buffer to do this and I
replace ; by #, I suppose there is nicer way to do this).

I often see email signature using this kind of formatting.

Do you know dedicated tools or text editor to do such things the easy
way on an everyday basis?


Have a nice day