How to instantly get notified of a new email in C#?

Question

Email

How to instantly get notified of a new email in C#?

Answer 1

To answer this question, you need to understand a few things.
Why the question is about mail - because you can be temporarily banned for unintentional DDos (many accesses to the resource with short intervals).
And then, automatically, the second question comes out, how much you can evaluate. Usually, mail clients poll mail with a delay of 5 to 15 minutes - here who has what settings.
If you need it faster, then here you can:
The second option is that either you pull mail from your server already with your IMAP timeout (more precisely, not mail, but new messages and, for example, only message headers - this is easier), or you come up with some another way of checking and subsequent notification (mail is stored in the database, for example).

Answer 2

client library for imap and check mail every 250 ms, if exception - try to log in again, if you can't log in for a long time - TODO