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Cannot send Attachment file in transfer.

hargendats

I cannot send Attachment file particular PDF file When I transfer e-mail. Usually, I can open file in attachment area, but I cannot open it when I transfer mail. White Icon is appearing, and file name is changing to "nsmail.tmp". Please help me.

I cannot send Attachment file particular PDF file When I transfer e-mail. Usually, I can open file in attachment area, but I cannot open it when I transfer mail. White Icon is appearing, and file name is changing to "nsmail.tmp". Please help me.
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That sounds like your anti virus messing up. I assume from the problem you are using avast. https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#AVAST