Use aenetmail IMAP client: github . I think this is the best alternative to GMailAtomFeed, because you can get all the email text, and it has many other features.
Here is an example:
using (var ic = new AE.Net.Mail.ImapClient("imap.gmail.com", "email", "pass", AE.Net.Mail.AuthMethods.Login, 993, true)) { ic.SelectMailbox("INBOX"); MailMessage[] mm = ic.GetMessages(0, 10);
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