Mailkit: [Question] NoOp called in the same time as Send an issue?

[SpiritBob]

I'm aware that there's no thread-safety for Send, but does that apply in-general to using the SmtpClient's publicly available methods?

Meaning if one thread is calling say Send, Verify, NoOp, no other thread is allowed to use the object, until the previously called operation completes?

Or is it only an issue if two threads call the same public method?

[jstedfast]

It's a problem if more than 1 thread calls any method on SmtpClient that sends any sort of command to the server.