Spintax is a simple syntax that creates multiple versions of your email automatically. It's one of the most important tools for cold-email deliverability, and one of the easiest to use.
Spintax uses curly braces and pipe characters to define options. When the email is sent, MailBeast randomly picks ONE option from each group.
Syntax: {option1|option2|option3}
Example:
{Hi|Hello|Hey} {{first_name}},
{I noticed|I saw|I came across} {{company_name}} and {thought you might find this relevant|wanted to reach out}.This could produce any of these combinations:
"Hi Sarah, I noticed Acme Corp and thought you might find this relevant."
"Hello Sarah, I saw Acme Corp and wanted to reach out."
"Hey Sarah, I came across Acme Corp and thought you might find this relevant."
Each recipient gets a different version.
When you send the exact same email to many recipients, Gmail and Outlook spot the pattern fast - and once they classify your message as bulk, it gets filtered to spam across all the accounts that received it.
Spintax breaks that pattern. Every recipient gets a slightly different email, so Gmail and Outlook can't lump your sends together. The result is better inbox placement.
Bottom line: if you're sending cold emails, use spintax on every message. It's not optional - it's the difference between landing in the inbox and landing in spam.
{Quick question|Thought for|Idea about} {{company_name}}{Hi|Hello|Hey} {{first_name}},{I noticed|I saw|I came across} {your company|{{company_name}}} {is growing|is expanding|has been making moves}.{Would you be open to|Are you available for|Could we schedule} a {quick call|brief chat|15-minute call}?{Best|Cheers|Thanks|Regards},The {Spintax} button on the right of the editor toolbar wraps the cursor (or your selection) in a {|} block - place your cursor where you want a spin, click the button, and start typing the alternatives separated by |.
The editor highlights spintax blocks with colored syntax so they stand out from the surrounding text, and the live word count at the bottom of the editor switches to a min-max range when spintax is present (e.g. 68-94 words) - the shortest and longest possible versions across every combination.
You can nest spintax blocks inside each other for more variation:
{Hi {Sarah|there}|Hello {friend|colleague}}This produces: "Hi Sarah", "Hi there", "Hello friend", or "Hello colleague".
Keep nesting shallow and readable. Over-nesting makes editing difficult and increases the chance of syntax errors.
Spintax and variables work together but are processed differently:
Spintax {option1|option2} - one random option is chosen per email.
Variables {{first_name}} - replaced with the lead's actual data.
Combine them freely:
{Hi|Hello} {{first_name}}, {I noticed|I saw} {{company_name}} {recently expanded|just raised a round}.Variables inside spintax are valid too: {I noticed {{company_name}} is growing|I saw your work at {{company_name}}}.
Two paths in the editor produce spintaxed content for you. Both are documented in The Sequence Editor → AI assistance:
Compose with AI (button under the body composer) - generates a spintaxed template for the current step only. Three short questions about your offer, customer, and pain point, then it writes the email with spintax built in.
AI Mode (toggle at the top right of the Sequence Editor) - generates the entire sequence at once. Every generated step lands with spintax already woven through the subject and body.
Either way, you can edit the result by hand afterwards - tighten the alternatives, rewrite a sentence, add more spin groups - just like any spintax block you'd write yourself.
Each spintax group multiplies with the others:
{3 options} × {2 options} × {4 options} = 24 unique versions
Guidelines:
Minimum: 10+ unique variations.
Good: 20-50 variations.
Excellent: 50+ variations.
3-5 spintax groups per email is a solid target. Each group with 3-4 options gives you plenty of variation without making the email hard to read or edit.
Different spintax options can have different word counts, so the editor reports a word-count range (min-max) instead of a single number. Use it to confirm every version of your email stays within a sensible length.
For example, if your email shows 68-94 words, every variation falls inside the 50-100 word sweet spot for cold email.
Use spintax in every cold email. This is the single most impactful thing you can do for deliverability after DNS setup.
Compose with AI template generation feature. It already generates helpful spintaxed copy that you can adjust further.
Keep all options natural. Each variation should read fluently. Use the Preview button on the editor to render a few different leads and skim the result.
Don't sacrifice readability for variation. A well-written email with 15 variations beats a confusing email with 200.
Vary whole phrases, not just single words. Swapping individual words helps a little; swapping whole sentences makes each version look distinctly different to Gmail and Outlook.
Check in preview. Missing closing braces or empty options would be visible in a preview window.