https://business.forums.bt.com/t5/Archive/dat-files-amp-emails-galore/m-p/22053#M3134 <P>Was the 5 copies of the message all the same mail or were did they say part 1/5, then 2/5.&nbsp; It may be that if it is a large attachment then Windows Mail will download the message in sections. Or the message just might have timed out on the incoming server and then was added to the queue again and again... If this was a one off instance I wouldn't worry about it to be honest.</P><P>&nbsp;</P><P>It sounds like your Windows Mail is not sending in HTML format, this can change attachments to .dat files, its fairly common, to change to HTML format follow the steps below:</P><P>&nbsp;</P><P>Open Windows Mail<BR />Select Tools from the menu bar along the top<BR />go down to options<BR />select the 'send' tab<BR />Under Mail Sending Format and Select HTML.</P> Mon, 14 Feb 2011 03:25:57 GMT PocketAces 2011-02-14T03:25:57Z https://business.forums.bt.com/t5/Archive/dat-files-amp-emails-galore/m-p/21405#M3133 <P>The last couple of days I have sent jpg files which have mysteriously arrived at their destination as .dat files. How does that happen?&nbsp; Also, the email arrived 5 TIMES but I only hit send once?&nbsp; What is going on?</P><P>Two weeks ago I went over to Windows 7 &amp; therefore Live Mail so is there some sort of mismatch going on program wise?</P> Sat, 29 Jan 2011 16:21:28 GMT https://business.forums.bt.com/t5/Archive/dat-files-amp-emails-galore/m-p/21405#M3133 barty2 2011-01-29T16:21:28Z https://business.forums.bt.com/t5/Archive/dat-files-amp-emails-galore/m-p/22053#M3134 <P>Was the 5 copies of the message all the same mail or were did they say part 1/5, then 2/5.&nbsp; It may be that if it is a large attachment then Windows Mail will download the message in sections. Or the message just might have timed out on the incoming server and then was added to the queue again and again... If this was a one off instance I wouldn't worry about it to be honest.</P><P>&nbsp;</P><P>It sounds like your Windows Mail is not sending in HTML format, this can change attachments to .dat files, its fairly common, to change to HTML format follow the steps below:</P><P>&nbsp;</P><P>Open Windows Mail<BR />Select Tools from the menu bar along the top<BR />go down to options<BR />select the 'send' tab<BR />Under Mail Sending Format and Select HTML.</P> Mon, 14 Feb 2011 03:25:57 GMT https://business.forums.bt.com/t5/Archive/dat-files-amp-emails-galore/m-p/22053#M3134 PocketAces 2011-02-14T03:25:57Z