I'm developing an Outlook add-in in VB using VS 2005 and VSTO 2005 SE. I use
a custom form that creates a new MailItem and I attach a file to it by the
add-in. If my Outlook email account is configured as a POP/SMTP client, the
recipient of the email receives a file called Winmail.dat instead of the
attachment. Interestingly, if the Outlook email account is setup as an
Exchange server client, then the attachment is received correctly by the
recipient.

How can I achieve the attachment to be sent correctly over an SMTP server?
Any idea would be appreciated.

Thanks,

Istvan