You just need to change the search code.

The following code searches for all email sent from alice:

List<long> uids = imap.Search(Expression.From("alice@company.org"));

Dim uids As List(Of Long) = imap.Search(Expression.From("alice@company.org"))

Read more about searching emails on IMAP server.

If you are using Gmail you also may also use Gmail’s specific search syntax (same as on Gmail web site).

With Mail.dll you can delete and manage email on any IMAP or POP3 server (including Exchange).

Outlook is a client application. If you want to delete email from a local pst store, Mail.dll is not going to help you, but if you want to delete emails from Exchange read this post: Delete email messages using IMAP. You may need to establish SSL connection but it’s quite easy just use ConnectSSL method.

Most likely your server does not require SSL. Just use Imap.Connect method in that case. Please also read this post: Connection attempt failed.

Please contat us directly if you have other connection problems.

I am getting this error.Can you please tell me how to fix this.

If you want to delete all emails in this folder replace the search code with:
List<long> uids = imap.GetAll();
-or-
Dim uids As List(Of Long) = imap.GetAll()

I like to delete my sent mails in gamil. how can i do this.

If you need to delete an email just use Pop3.DeleteMessage or Pop3.DeleteMessageByUID method.