ip address temporarily blacklisted for thunderbird android mobile by Avast mobile Web Guard

Hi Thomas

What is the issue your having with the app and how have you reached your conclusion? Please provide as much detail as possible so community members have the information needed to assist you! Please include your app version and the email provider name!

Version14.0 of Thunderbird. Outgoing emails hang up in Outbox...can not send. Then message that IP temporarily blacklisted and a notification that excessive failed authentication.

Hi Thomas

Could you try re-entering your password within the incoming and outgoing server setting pages, helping rule this out as the cause of the authentication errors. The temporary block could be due to the repeat authentication failures every time the app tries to sync.

If you use Oauth2, you can try clicking next through the server settings and check authentication succeeds.

Do you use a VPN on your phone. Some email providers temporarily block connections when they determine the IP location is unusual for the user. E.g. originating from a different country. You might need to login to your mail providers web page and confirm it was yourself trying to connect.

Rebooting your router will often give you a new public IP address (DHCP). See if the blacklist is still an issue thereafter.

Is the issue only when sending emails, or with receiving them also?

Hi Thomas

Could you try re-entering your password within the incoming and outgoing server setting pages, helping rule this out as the cause of the authentication errors. The temporary block could be due to the repeat authentication failures every time the app tries to sync.

If you use Oauth2, you can try clicking next through the server settings and check authentication succeeds.

Do you use a VPN on your phone. Some email providers temporarily block connections when they determine the IP location is unusual for the user. E.g. originating from a different country. You might need to login to your mail providers web page and confirm it was yourself trying to connect.

Rebooting your router will often give you a new public IP address (DHCP). See if the blacklist is still an issue thereafter.

Is the issue only when sending emails, or with receiving them also?

Platform34: Thanks so much for your prompt and detailed responses to my issues! Tried all your suggestions without resolution but your suggestions led me to figure out the outbox and occasionally inbox email blocks were most likely due to Web Guard, a sub feature (antivirus) for my Avast Mobile Security app. I never had this problem with my email account thru my desktop or laptop. So I have disabled this Web Guard on my mobile and all seems to work well now. Again, much thanks for being there and taking this on. God bless!

Thomas, thanks for reporting this.

They have an article about reporting false positives, but couldn't find one specific for mobile: https://businesshelp.avast.com/Content/Products/General_Help/SampleSubmission/SubmittingFalsePositives.htm. Seems that there is an option within their app: https://support.avast.com/en-gb/article/66/#pc: -> "How can I report a false positive detection to Avast Threat Labs?"

Wayne, this was not at all detected by the program, so I don't qualify it as a false positive. Tried to report it to them anyway but couldn't get past the pull down list of options (no "other" category).