Email Content

Content is the layer most visible to recipients and to spam filters. A technically sound setup (authentication, list hygiene) can still fail if the content looks like spam. This skill covers everything between the sending server and the reader's eyes.

Related skills: authentication/SKILL.md (technical foundation), compliance/SKILL.md (CAN-SPAM required footer elements), transactional/SKILL.md (transactional-specific content patterns), marketing-campaigns/SKILL.md (campaign copywriting and structure)

Subject Lines

The subject line determines whether the email gets opened or marked as spam before being opened. It also carries deliverability weight: spam filters evaluate subject lines independently from body content.

Length