Thanks for writing to Aspose.Email support team and accept our apology for delayed response.
Printing emails to TIFF using Aspose.Email is not supported at present and this feature is already logged in our issue tracking system under issue id:NETWRKJAVA-33181 for implementation. However, I would also like to share that we won’t be able to support it in the nearest future due to other high priority tasks in our development plan. We appreciate your understanding in this regard.
I have linked this ticket with the current thread, so you will be automatically notified once this feature is implemented and respective version is released online.