Spintax lets you rotate words, phrases, or sentences in your emails so each recipient gets a slightly different version. This adds variety, helps you see which phrasing resonates, and improves deliverability by avoiding identical content across a large send. You manage tags under Campaigns → Spintax.
To create a tag, click Add New, enter a tag name (letters, numbers, underscores, and hyphens only), and list one variation per line — for example a greeting tag with Hello, Hi, and Hey. The system randomly picks one value at send time. You then insert the tag anywhere in your content as {{tag_name}}, either by typing it or via the Spintax dropdown below the editor. Spintax works in the email subject, from name, pre-header, HTML body, and text content of broadcasts and drips, and combines well with recipient fields, e.g. {{greeting}} %%first_name%%. A Pre-Defined Templates library lets you clone ready-made tags and edit them to match your voice.
Worth knowing: if the same tag appears multiple times in one email, every instance gets the same randomly selected value; tag names can't be renamed after creation (create a new tag instead); deleting a tag that's still used makes {{tag}} appear as literal text in emails; and 3–5 consistent variations per tag (similar tone, length, and meaning) is the recommended sweet spot. Content processes in order: dynamic tags, then Spintax, then recipient fields.