A method which was in progress when Abort method has been called will throw MailBeeUserAbortException.

This method tries to abort the current network operation immediately, which works for all cases except of resolving a domain name into IP address. Due to .NET framework limitations, this operation cannot be aborted. Thus, sometimes you may experience a several seconds delay between calling this method and getting MailBeeUserAbortException (the time needed for DNS resolve to complete).

Note
No events will be raised after this method has been called.

Reference