Learning Center / Frequently Asked Questions

What Is an Undeliverable Subscriber?

An Undeliverable Subscriber is a contact or email address that PrimeSender is unable to successfully deliver any emails to. The most common reason for this is a mistake in the spelling of the email address. Try to verify that you have the correct email address and try again.

Another reason may be that this email address does not exist anymore. In this case, we recommend that you remove this contact from your list.

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