GmailID and UID when sending a new email using SMTP?

Question

How can I get the GmailID and the UID when I send a new email using SMTP?

Answer 1

SMTP protocol doesn't return such data data in any way.

What you can do, is to use IMAP to select "Sent Itmes" folder and find the sent message.

I think the best way to do it, is to remember "Message-ID" header of the message before sending (IMail.MessageID) and using that in a search query.

using(Imap imap = new Imap())
{
    imap.ConnectSSL ("imap.gmail.com");   
    imap.UseBestLogin("user", "password");

    var common = new CommonFolders(imap.GetFolders());
    imap.Select(common.Sent);

    List<long> uids = imap.Search(
        Expression.MessageID(email.MessageID));

Then use GetMessageInfoByUID or GetEnvelopeByUID to retreieve Gmail MessageId (Envelope.GmailMessageId)