Nimble does not support POP3 / POP email for message sync. POP3 is an older email protocol that requires messages to be downloaded locally to the email client where they are viewed. 

Nimble only supports IMAP email because it allows you to sync your email messages across multiple email clients, such as Mail, Outlook, iPhone, Gmail, and Nimble. 

If you are using a third-party service provider, and are still using POP3 email, we recommend contacting your service provider to see how you can to switch to IMAP, as this will allow you to use your email account across multiple devices. 

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If you have any questions, please write us at care@nimble.com, initiate a chat from this FAQ, or join one of our Nimble Onboarding and Best Practices sessions, held every weekday at 9 AM PT.