Ends the pending asynchronous download envelopes request.
On success, a EnvelopeCollection object representing the downloaded envelopes; otherwise, a null reference (Nothing in Visual Basic).
| Exception Type | Condition |
|---|---|
| MailBeeException | An error occurred and ThrowExceptions is true. |
Imap Class | MailBee.ImapMail Namespace | BeginDownloadEnvelopes