Why is the size of my email about a third bigger than the size of its attached files?

Become or hire the top 3% of the developers on Toptal https://topt.al/25cXVn

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Music by Eric Matyas
https://www.soundimage.org
Track title: Flying Over Ancient Lands

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Chapters
00:00 Question
00:47 Accepted answer (Score 215)
01:33 Answer 2 (Score 51)
03:32 Thank you

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Full question
https://superuser.com/questions/1139323/...

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Content licensed under CC BY-SA
https://meta.stackexchange.com/help/lice...

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Tags
#email #thunderbird #base64

#avk47