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Access to my yahoo mail account has stopped working, it keeps asking for the password which I have re-entered

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I have three email accounts, one of which is yahoo, which I access via Thunderbird version 52.2.1. All has been working fine until today. I started getting a "login failed" box that says "login to server imap.mail.yahoo.com failed" with options to retry,enter new password or cancel. I have tried entering my yahoo password but that hasn't helped. Thunderbird is installed on my PC running Windows 10. I am not having this problem accessing all my email accounts on my iPhone 6. Can someone suggest what to try next? Thanks.

I have three email accounts, one of which is yahoo, which I access via Thunderbird version 52.2.1. All has been working fine until today. I started getting a "login failed" box that says "login to server imap.mail.yahoo.com failed" with options to retry,enter new password or cancel. I have tried entering my yahoo password but that hasn't helped. Thunderbird is installed on my PC running Windows 10. I am not having this problem accessing all my email accounts on my iPhone 6. Can someone suggest what to try next? Thanks.

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You may need to 'Allow apps that use less secure sign in'. https://help.yahoo.com/kb/SLN27791.html

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Chosen Solution

You may need to 'Allow apps that use less secure sign in'. https://help.yahoo.com/kb/SLN27791.html

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I already had the "allow apps that use less secure sign in" selected. But I unselected and reselected it and Thunderbird is now accessing the yahoo account. Thank you!