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The Ultimate Glossary: 44 Email Marketing Terms Marketers Must Know

Hubspot

Blacklist - A list that denotes IP addresses as spammer IPs, impeding email deliverability. CTR (Click-Through Rate) - The percentage (the number of unique clicks divided by the number that were opened) of recipients that click on a given URL in your email. Over 90% of email sent is classified as spam. 25 per email address.