Missing Attachments

I receive mails with missing attachments. But the same mail has attachments when is opened with other mail clients as Outlook or even webmail. EM Client 7.0.26567.0. How can I fix this?

Hello,

It is probable that you were sent a message in RTF, sent from an older or incorrectly set up version of Outlook. Did you receive an attachment called “winmail.dat”?