Images as Attachments

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When images are in a signature or a stationery/theme in Outlook 2007/2010, sometimes these are sent as attachments, and other times they are not. I am trying to figure out if it is something to do with the SMTP server, as we use three different ones (Fasthosts, Eclipse, and Google Apps) depending on the user.

Anybody have any ideas?

 

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if the signature is HTML based does that change anything?

 

The user must bring HTML the way open.