Problem including the file .jpg in the message
Hi
I've been using thunderbird for ages with our corporate signature, html including our company logo 
Since about 1-2 month I am unable send an email with the full signature including logo, it returns the following error message (which is very annoying). "There was a problem including the file xxx.jpg in the message. Would you like to continue sending the message without this file?"
What is the problem with that? Are image files not allowed any longer in the signature?
Please explain
Solution choisie
You might check to see where the location of your image file is. If it's a hyperlink reference, perhaps the location has changed. The same can happen with local files if the image has been moved to another folder.
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What anti virus are you using?
Thank you for your reply Matt
I don't use any
in that case disable auto save to drafts in the preferences and see how you go.
I unticked -> Preferences > Composition > Autosave every x minutes Didn't help, still the same annoying issue :(
Solution choisie
You might check to see where the location of your image file is. If it's a hyperlink reference, perhaps the location has changed. The same can happen with local files if the image has been moved to another folder.
Thank you for your suggestion ParishMills, but sadly this is not the reason. I checked it first, I even re-uploaded the image to the server where it is hosted.
I delete completely the Thunderbird client from my computer and re-install it. Will I lose some of my emails?
Is it possible your HTML syntax has some errors?
Oh, thank you ParishMills, your answer helped. Probably on my latest signature edit I removed a piece of the html. I added missing tags, now all works perfectly :)
Thanks a bunch!