Glossary

Webhooks are HyperText Transfer Protocol (HTTP) callbacks that push data from one application to another after a specific event occurs, like an email delivery. For example, if a company sends a newsletter to its subscribers but the email bounces back, a webhook can log the bounce, capture the data, and send a notification to designated recipients.

Now referred to in the industry as an allowlist or a passlist, a whitelist is a system used to allow only certain senders or messages to pass through a filter. All other senders or messages are blocked.

Whitelisting emails means adding email addresses to an approved sender list. This informs email service providers to attempt to send email to these addresses, even if the email IDs are on an email bounce list. Companies whitelist email domains from certain senders to ensure they receive their emails. This signals inbox service providers (ISPs) to trust these email addresses and not place them in the spam folder.

A wireframe is a rough sketch of an interface, like an email template or website. Wireframes don’t usually use colors or graphics to convey the layout of the final product. Instead, designers use lines and shapes to depict elements of the final product, where lines indicate text and shapes denote images or graphics. These minimal mock-ups are named after the skeletal frameworks that look like they consist of “wires.”