Mail.dll allows creating, sending (SMTP), receiving (POP3,IMAP) and parsing messages (MIME, S/MIME). Printing is definitely out-of-scope for the library.
Still it shouldn't be that hard to implement as all email data are exposed by IMail object (IMail.Subject, IMail.Date, IMail.From, IMail.Attachments).
If you are creating windows application use System.Printing namespace. If you are using ASP.NET either prepare a page and use "javascript:window.print();" or consider using PDF (PdfSharp.dll)