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Fails to log in to my service provider (videotron.com)

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Few days ago my email stopped as failed to log in to my service provider(i.e. videotron.com). Went over provider and checked everything and he concluded issue was with Thunderbird.How can I fix without losing all my stored emails messages. Thanks.

Few days ago my email stopped as failed to log in to my service provider(i.e. videotron.com). Went over provider and checked everything and he concluded issue was with Thunderbird.How can I fix without losing all my stored emails messages. Thanks.

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If you updated Thunderbird then it is possible that your firewall may not be recognising the updated verion.

Example: I use Norton Anti-Virus/Firewall. Sometimes, after an update, Norton still thinks it can allow only the previous version. I then have to close Thunderbird and access Norton. Settings > Network > Smart Firewall > Program Rules Locate Thunderbird and set to 'Allow' On one occassion, I have had to block, ok and then reset to Allow.

If you use another Firewall/Anti-virus program, then there will be similar settings. So check this first.

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If you updated Thunderbird then it is possible that your firewall may not be recognising the updated verion.

Example: I use Norton Anti-Virus/Firewall. Sometimes, after an update, Norton still thinks it can allow only the previous version. I then have to close Thunderbird and access Norton. Settings > Network > Smart Firewall > Program Rules Locate Thunderbird and set to 'Allow' On one occassion, I have had to block, ok and then reset to Allow.

If you use another Firewall/Anti-virus program, then there will be similar settings. So check this first.

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Thanks for your comments. I am using Malwarebytes Anti-Malware. Not sure how to get to same steps as Norton. But ran another update of Malwarebytes and guess what??...... my email started working and received all my emails for last 3 days. Thanks for your help.