Mail keeps asking for my password but the password is correct

i have the same issue. i tried what millvalley recommended, did not help me. i did notice that when i click on the dropdown in outgoing mail server it tells me i'm offline. what is going on?????

You will find the solution on the Bell.net mail account. To make the life of Apple users difficult, Bell's default was to prevent POP users to access the Bell.net mail. However, they were nice enough to provide the option for users of POP to enable or disable this setting. Follow this procedure:

Log in to your Bell.net mail account

go to Managing your Account;

Go to the subdirectory Connect devices and apps with POP

Change the setting to Enable and Save

After I modified the setting, everything returned to normal in my case.

My particular version of this problem is that the Yahoo mail password in Ipad mail settings is periodically changed from the 10-character pwd I normally use to 8 characters. Oddly, this usually doesn't prevent yahoo mail from functioning both in Mail and in the Yahoo Mail app which I have also installed, but occasionally I receive a message that mail cannot be sent because the server is not recognized or some other failure notice, at which point I change the setting back to the correct password and mail functions correctly again. However, several days or weeks later, I find it is changed again from 10 to 8 characters.

I had changed my password for Comcast mail, then before I could adjust Apple Mail I got the notification about can't connect, bad password. Your tip of just closing out the pop up box for password and typing it directly into the accounts setting field for password worked for me. I tried numerous times putting the password into the pop up box, but it would not work.

Thanks!