MSGID: 2:221/1.58@fidonet f762787d
PID: OpenXP/5.0.50 (Win32)
CHRS: ASCII 1
TZUTC: -0500
I just learned about another email service, but this one  
optionally supports OpenGPG.


https://www.gmx.com/security/encryption/

[o] 65GB storage
[o] attachments up to 50MB


Externally produced pub keys are supported so that you can  
exchange encrypted messages with other users such as protonmail  
and startmail as long as the systems use OpenGPG.

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