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One template. A different wording for everyone.

Spintax rotates phrasing per recipient — write inline choices like [Hi|Hello|Hey] or reuse a saved tag, and each contact gets one consistent resolution. It softens the repetitive content fingerprint that pushes high-volume sends toward the bulk folder.

Get started Why it helps delivery →
  • Inline [a|b|c] choices
  • Saved tags you reuse anywhere
  • Deterministic per recipient
  • Every field — subject to text part
subject line · spintax

Template

[Hi|Hello|Hey] %%first_name%%, {{offer_line}}

Resolves to

  • Ada Hi Ada, your 20% off ends Friday
  • Ben Hello Ben, your 20% off ends Friday
  • Cleo Hey Cleo, your 20% off ends Friday
same tag, same value per recipient{{offer_line}} saved

Two ways to spin

Inline choices, or saved tags.

Quick one-offs go inline; anything you want to reuse or tweak in one place becomes a saved tag. Both resolve the same way at send.

Inline [a|b|c]

Drop alternatives right into the copy with square brackets and pipes. At send, each recipient gets one of the options — no setup, no definition.

[Thanks|Cheers|Talk soon], the team

Saved tag {{offer_line}}

Define a reusable spin under Content → Spintax and reference the tag wherever you need that rotation — change the value list in one place and it updates everywhere it's used.

{{offer_line}} → one of several stored lines

The behaviour that matters

Same tag, same value — all the way down a single email.

This is where naive content-spinning falls down. If {{greeting}} appears in the subject and again in the body, a careless tool might pick "Hi" once and "Hey" the next — and the recipient gets a message that reads inconsistently.

Mumara resolves per recipient, not per occurrence: whichever variant a contact draws, every instance of that tag in their message uses it. The randomisation is between people, never within one person's email — so you can spin tone freely without it ever reading broken.

{{greeting}} · one recipient: Ben

Subject

Hey Ben — your cart's still warm

Body opener

Hey Ben, just a quick nudge…

Both drew Hey — consistent for Ben. Ada's email might draw Hi throughout.
per recipient, not per occurrenceinternally consistent ✓

Where it applies

Wherever wording lives, spintax reaches.

Variation that only touches the subject still ships an identical body to everyone. Spintax spreads across the whole message, so the spin isn't cosmetic.

  • Subject line

    Where inbox-placement diversity matters most — rotate the line every recipient sees first.

  • From name

    Vary the sender label subtly across the send without spinning the address itself.

  • Pre-header

    The preview snippet beside the subject — another visible surface to diversify.

  • HTML body

    Greetings, sign-offs, calls to action — the bulk of the content, spun line by line.

  • Plain-text part

    The text alternative spins too, so both versions of the email vary in step.

  • Across send types

    The same saved tags work in broadcasts, drips, and recurring sends — define once, reuse everywhere.

One saved tag can drive variation across every one of these surfaces at once.

Why it helps deliverability

Identical mail looks mechanical. Varied mail looks human.

When ten thousand recipients get a byte-for-byte identical message, that uniformity is itself a signal filters weigh. Rotating phrasing across the send softens that fingerprint.

Spintax resolves deterministically: the same tag produces the same option for a given recipient, every time it appears in their message. So a person never sees "Hi" in the subject and "Hey" in the body — their copy is internally consistent, just different from the next person's.

It works everywhere wording matters — subject line, from-name, pre-header, HTML body, and the plain-text part — so the variation spreads across the whole message, not just one field.

It's a deliverability tactic, not a personalization gimmick: the goal is to reduce the repetitive content fingerprint of a large send, which pairs naturally with proper authentication and clean lists to keep high-volume mail landing in the inbox.

What teams do with it

When a little variation goes a long way.

  • High-volume identical sends

    The situation
    A big promo goes to the whole list at once.
    What spintax does
    Rotating phrasing across the send softens the repetitive fingerprint that uniform bulk mail presents to filters.

  • Subject-line diversity

    The situation
    You want the first line to vary across recipients.
    What spintax does
    A spin tag on the subject gives each contact a slightly different line — the surface filters scrutinise most.

  • A house tone, varied

    The situation
    You want greetings and sign-offs to feel less stamped.
    What spintax does
    A saved greeting tag rotates the opener per recipient while staying consistent within each person's email.

  • Reusable brand phrases

    The situation
    The same rotating phrase appears across many sends.
    What spintax does
    Define it once as a saved tag and update the variants in one place — every send that references it follows.
“We send big promotional batches, and adding spintax to the subject and the opener was a small change with a real effect on placement. The part I didn't expect to care about — same-tag-same-value — turned out to matter: our emails never read like a glitchy mail-merge, because each person's copy is consistent end to end.”

Verified review

Mumara ONE customer

Trustpilot

Common questions

What buyers usually ask.

What's the syntax?

Two forms. Inline: square brackets with pipe-separated options, like [Hi|Hello|Hey]. Saved: a reusable tag in double curly braces, managed under Content → Spintax and referenced wherever you want that rotation. (It's bracket-pipe for inline, not single curly braces.)

Will one recipient see mismatched wording?

No. Spintax is deterministic per recipient — the same tag resolves to the same option throughout that contact's message, so their copy is internally consistent even though it differs from the next person's.

Where can I use it?

Anywhere wording lives: the subject line, from-name, pre-header, HTML body, and the plain-text part. The variation spreads across the whole message, and the same saved tags work across broadcasts, drips, and recurring sends.

How does it interact with merge tags and conditional content?

They layer. The platform resolves conditional blocks first, then spintax, then your %%field%% merge tags — so a spun line can still contain a merge tag that fills in per contact. Spintax rotates the phrasing; merge tags fill in the data.

Is this about personalization or deliverability?

Primarily deliverability. The point is to reduce the repetitive content fingerprint of high-volume identical sends. It complements personalization rather than replacing it.

How many variants should I write per tag?

A small handful is plenty — a few well-chosen alternatives per tag give meaningful variation without becoming hard to maintain. The aim is natural-sounding variety, not maximum entropy.

Related

Pages that pair with this one.

Mumara ONE · Spintax

Make a bulk send look a little more human.

Inline choices and saved tags rotate phrasing per recipient, deterministically, across every field — softening the repetitive fingerprint of high-volume mail.

Get started See pricing