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.

Avatar for Username

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

Ova tema je arhivirana. Pitajte drugo pitanje ako vam je potrebna pomoć.

One of your filters uses a custom header that contains an invalid character ....

  • 1 odgovor
  • 1 ima ovaj problem
  • 6 views
  • Posljednji odgovor poslao Magini

Magini
Magini
more options

When I send an email the following error message is displayed:

"One of your filters uses a custom header that contains an invalid character, such as ':', a non-printable character, a non-ascii character, or an eight-bit ascii character. Please edit the msgFilterRules.dat file, which contains your filters, to remove invalid characters from your custom headers."

This is followed by a message saying that the email has been sent and saved despite the error.

The problem happened after transferring to Windows 10 (from Win 7)

I have deleted ALL msgFilterRules.dat files and ALL filters, but the message persist.

Any suggestions on what else to try?

Thanks, Ben

When I send an email the following error message is displayed: "One of your filters uses a custom header that contains an invalid character, such as ':', a non-printable character, a non-ascii character, or an eight-bit ascii character. Please edit the msgFilterRules.dat file, which contains your filters, to remove invalid characters from your custom headers." This is followed by a message saying that the email has been sent and saved despite the error. The problem happened after transferring to Windows 10 (from Win 7) I have deleted ALL msgFilterRules.dat files and ALL filters, but the message persist. Any suggestions on what else to try? Thanks, Ben

Izabrano rješenje

Problem solved.

After deleting all imap mail folders/entries the problem went away.

Pročitajte ovaj odgovor sa objašnjenjem 👍 0

All Replies (1)

Magini
Magini Vlasnik pitanja
more options

Odabrano rješenje

Problem solved.

After deleting all imap mail folders/entries the problem went away.