Do you have an anti virus scanning outgoing mail. If you have stop it doing so and see if that helps.

The code appears to be the start of a PDF file. That %PDF-1.7 sort of gives it away as being a acrobat V8 file format. Have you tried adding a signature file to Thunderbird perhaps?

Hi Matt No out going email is not scanned and cant digitally sign email as its greyed out.I dint know if this helps but this is all the text that goes out with the email Regards Robert

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Hi sfhowes Problem sorted thank you and Matt for your help and advice

Regards Robert