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I am under Lubuntu 12.10 with thunderbird 16.0.2

When I send a pdf file, people who receive it cannot open this pdf with acrobat or evince. It appears that in the source of the mail, thunderbird said that my pdf file is a plain/text file instead of a binary or a pdf file.

I look at this but it does not solve my problem.

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Check if attached .pdf files are automatically opened with e.g. Acrobat when clicking on an attachment (by opening your Thunderbird's preferences).

For me, the problem occurred as soon as I determined to not to be asked anymore what application I want the .pdf to be opened with. All outgoing mails immediately stopped having proper .pdf's attached.

I reset it to "ask me" and .pdf's are .pdf's again...

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Pdf document are seted to "ask me". But I have 2 lines for pdf document. One with application/pdf:.pdf and another with image/%22pdf?.... Should I delete the second ? – Ger Jan 28 '13 at 12:32
The second one (image/%22pdf?...) seems to be an invalid MIME type. You could delete this without affecting functionality of downloads/attachments with valid MIME types. Nevertheless, resetting application/pdf:.pdf should bring back proper .pdf attachments, doesn't it? – user127066 Feb 1 '13 at 18:42
@user127066 Please use the contact us link at the bottom of this page to ask for your unregistered account and your new registered account to be merged. Thanks. – fossfreedom Feb 2 '13 at 9:00

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