Hol up. Sorry but email blows, period. Over complicated, close to no privacy, convoluted, extraordinarily centralized, censored by ISPs (hosting your own), unequal message/spam/security treatment from big tech email providers. Plaintext by default, server to server plaintext. Uses dns to provide basic security/integrity/spam prevention, that big tech providers regularly ignore. At best unencrypted smtp metadata. Its a hot disgusting mess. Foss servers are dying every day, there are so few foss imap clients that actually function, have modern features and are even close to regularly updated. 

Great podcast explaining some of the mess from ValueStack
https://valuestack.xyz/how-email-was-captured-with-jameson-lopp/