A protected list of email addresses you should never message, including unsubscribed, bounced, or complaint-prone contacts.
Scarcity communicates limited availability or time to encourage visitors to make a decision sooner.
Scroll depth measures how far visitors move through a page, helping marketers evaluate content engagement and placement.
A scroll trigger activates when a user scrolls a set portion of a page. It targets engaged visitors with timely messages or offers.
A seed list uses test addresses to monitor email delivery, appearance, and links before and after a campaign sends.
Send-time optimization schedules emails when each recipient is most likely to engage.
SERP Volatility measures how often and drastically the rankings in Search Engine Results Pages (SERPs) change over a specific period.
Session duration tracks how long a visitor stays on your site in one visit. It reveals how engaging and valuable your content is to users.
A replay of user interactions that helps marketers identify usability problems and conversion barriers.
Simple Mail Transfer Protocol is the standard protocol used to send and deliver emails between servers.
Social proof uses evidence of other people’s choices or results to reduce uncertainty and support conversion decisions.
A soft bounce occurs when an email is temporarily undeliverable due to issues like a full inbox, a busy server, or a message that's too large.
A spam filter scans incoming emails to detect and block unwanted or malicious messages. It uses rules like suspicious keywords, excessive links, or unverified senders to identify spam and keep inboxes clean.
Spam score predicts how likely your email is to be flagged as spam, based on content, sender reputation, and technical setup.
SPF is an email authentication method that specifies which mail servers are authorized to send emails on behalf of a domain.
Statistical power estimates whether a test is capable of detecting a meaningful conversion difference.
A measure of whether an observed test result is likely real rather than caused by random variation.
A subject line is the text shown in a recipient’s inbox that summarizes an email’s content.
A subscriber list is a collection of email addresses from individuals who have chosen to receive communications from a brand.
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