AI email writers use large language models to generate email body copy, subject lines, CTAs, and entire sequences from prompts. They can write in specific tones (professional, casual, urgent), match brand voice, personalize opening lines based on prospect data, and generate multiple variants for testing. Best practice: use AI-generated copy as a first draft, then edit for brand voice and accuracy. MisarMail's AI campaign builder generates complete email sequences from a single target description.