"Unkown command" while using imap.StartTLS()

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imap.Connect(txtmailIncMailSrver.Text.Trim());
imap.StartTLS();

after excecuting the imap.StartTLS(), it throws an error like unknown command

Please provide me solution

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1 Answer

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It looks like your server is not supporting STARTTLS command (explicit SSL/TLS mode, where you first connect on plain text port and then secure the connection).

Consider using ConnectSSL instead:

imap.ConnectSSL("imap.example.com");
imap.UseBestLogin("user", "pass");

You can find more details on how to use SSL/TLS and IMAP here:
https://www.limilabs.com/blog/use-ssl-with-imap

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