how can I redirect mail (like OWA). Standard the Exchangeserver not allowed to redirect mails to an outside mail. Is it possible to do this, with this software ?
Are you a software developer?
yes, with active License
Generally on the client side you can only forward or reply to an email.
There is no such thing as redirects in SMTP/IMAP/POP protocols.
Forwards and replies are just regular emails, they only have In-Reply-To and References headers added. It's also customary that original email is somehow attached to the message. Either inline or as an attachment.
In-Reply-To
References
There are 2 classes that help with that ForwardBuilder and ReplyBuilder:
ForwardBuilder
ReplyBuilder
https://www.limilabs.com/blog/forward-email
https://www.limilabs.com/blog/forward-email-as-attachment
https://www.limilabs.com/blog/reply-to-email
Having said all that, you can create any email with Mail.dll. You can simply download a message, change IMail.To and send such message again - I think it would work as redirect.
IMail.To