This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

unable to open temporary file c:\users\myname\appdata\temp\nsmail

more options

When I try to send an e-mail I get the message: "Sending of the message failed. Unable to open the temporary file C:\Users\JOHNTO~1\AppData\Local\Temp\nsmail.tmp. Check your 'Temporary Directory' setting."

When I go to %temp% there are several files listed that I don't know where they come from. e.g. tmpaddon-133734 or nsmail.eml or nsmail.html. When I click OK and try to send again, it creates additional nsmail.eml files. Eventually the email might go. Sometimes I can delete some of the files in the Temp folder and the message will be sent. This problem just started in mid-May.

When I try to send an e-mail I get the message: "Sending of the message failed. Unable to open the temporary file C:\Users\JOHNTO~1\AppData\Local\Temp\nsmail.tmp. Check your 'Temporary Directory' setting." When I go to %temp% there are several files listed that I don't know where they come from. e.g. tmpaddon-133734 or nsmail.eml or nsmail.html. When I click OK and try to send again, it creates additional nsmail.eml files. Eventually the email might go. Sometimes I can delete some of the files in the Temp folder and the message will be sent. This problem just started in mid-May.
Attached screenshots

All Replies (6)

more options

every time I see this error is is caused by an anti virus product. Avast is the know cause, but there could be others.

See https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#AVAST

more options

I turned off the BitDefender Antispam function. It still fails to send e-mails, but posts to the Temp folder "tmpaddon-xxxxxx" and "nsemail.eml". When I try to delete all of the files in the Temp folder, it won't let me delete the tmpaddon files, but when I delete all of the nsemail.eml files,, it allows me to send an e-mail. Help.

more options

nsemail.eml Why not do what had to be done with avast and create an exception of those files in it"s scanning. Clearly you are not going to get relief from your problem unless you stop bitdefender over reaching.

more options

Cannot forward emails. I can send and receive emails normally.

OS Win7 Ultra-64bit

Immunet 6.2.4.10819 & MS Security Essentials

Thunderbird 60.3.3 (32-bit) "You are currently on the release update channel."

more options

What could be stopping Thunderbird accessing a file in the temp folder? Probably Immunet But someone else's topic is not the place to discuss your problems. Please ask your own question.

https://support.mozilla.org/en-US/questions/new

more options

My apologies for the improper post. Re-posted using the link you sent.