It is possible to display non-Latin characters in the "From Address" input during an emailing, but it requires a few steps.
For example, when you want to use Japanese characters in the "From Address" field, such as "ヤニック".
Translate the string into UTF-8
There are a bunch of websites which allow you to do that. This one does a good job: https://r12a.github.io/apps/conversion/
Paste the non-Latin character string into the green text box and click on "Convert":
Go down to UTF-8 code units and copy the result:
Fill the spaces
Open Notepad and paste the UTF-8 string (E3 83 A4 E3 83 8B E3 83 83 E3 82 AF).
Then, make a replace of " " with "="
Hopefully, you will get this new string: E3=83=A4=E3=83=8B=E3=83=83=E3=82=AF
Add it in "From Address"
There is some specific rules to know about the MIME (Multipurpose Internet Email Extensions). Please refer to this article.
The mandatory form for the Encoded Word is: "=?charset?encoding?encoded text?=".
The constant part will always be: =?UTF-8?Q?= and must always finish with a ?=
The final string to paste in the "From Address" will therefore be . . .
=?UTF-8?Q?=E3=83=A4=E3=83=8B=E3=83=83=E3=82=AF?= <your email address>
And the email received will be like this: