No, it is not necessary to have both POP and IMAP active at the same time when using a client like Zoho Mail to access your email. You can choose to use either POP or IMAP based on your needs and preferences.

POP (Post Office Protocol) is an older email protocol that downloads email messages from a server to a client, removing them from the server. This is best for users who only need to access email from one device.

IMAP (Internet Message Access Protocol) is a more modern email protocol that allows email messages to remain on the server, synchronized across multiple devices. This is best for users who need to access email from multiple devices.
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