Koltrix
Email API
Email validation at signup: what to check, and what not to
Validate signup addresses with syntax checks, domain and MX lookups and typo suggestions, but skip SMTP probing. A layered approach with code.
4 min read
Email APISuppression lists: what to suppress and for how long
Hard bounces, complaints and unsubscribes each deserve different suppression rules. Design a suppression list, scopes and expiry that protect reputation.
5 min read
DeliverabilitySpam traps: pristine, recycled and typo traps explained
Spam traps are addresses that should never receive your mail. How each type ends up on lists, what hitting them signals and how to stop it happening.
5 min read