Intermittently cannot receive emails but can send. Error message 'invalid username or password' for my pop3 email account.

Sometime when I am away from home, I can be happily sending and receiving emails on my ipad2. Out of the blue I get a message 'Cannot get email. Username or password invalid'. On returning home it works again. Sometimes I delete the account and readd it and this fixes the problem but I'm getting tired of doing that. Can anyone help please?

Check here:
Settings > Mail, Contacts, Calendars > Verizon > SMTP > smtp.verizon.net > Password
Is your password set there? Is it set correctly?

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Intermittently cannot receive emails but can send. Error message 'invalid username or password' for my pop3 email account.

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