Nimble does not support POP3 / POP email for message sync. POP3 is an older email protocol that requires messages bet downloaded locally to the email client where they are viewed.
Nimble only support IMAP email because it allows you to sync your email messages across multiple email clients, such as Mail, Outlook, iPhone, Gmail, 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 to switch to IMAP, as this allows you to use your email account across multiple devices.
If you have any questions, please write us at firstname.lastname@example.org, initiate a chat from this FAQ, or join one of our Nimble Onboarding and Best Practices sessions, held every weekday at 9 AM PT.