Annotate nullable reference types in public APIs #1972
Description
Is your feature request related to a problem? Please describe.
No, I did not have a problem with NullReferenceException in MailKit code yet. However, I find nullable reference types a very useful feature that would be great if a popular library supported it.
Describe the solution you'd like
Enable nullable reference types for the entire codebase now that jstedfast/MimeKit#1067 is resolved.
Describe alternatives you've considered
N/A
Additional context
I might be able to start working on this like in MimeKit but do not want to give dates yet.