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A multilingual campaign is one campaign that goes out in more than one language. One template holds an English and a German version, one audience is selected, and every contact receives the language they asked for. There is no second campaign, no second segment, and no second report to reconcile. Multilingual campaigns are automatic. If the template a campaign links to has more than one language, the campaign is multilingual. There is no switch to turn on. The Multi-language send panel on the Review & Send step, listing each language with its recipient count, subject and sender, and the primary-language fallback summary

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The Three Pieces

Three things work together. Each has its own page in this section.

A template with languages

Add languages to a template in the email editor. Do this first: a campaign can only send the languages its template has.

A contact language property

A property on each contact that says which language they want. Designate one, or let Lettr find it by name.

The campaign

Optional per-language subject and sender, a review panel that shows who gets what, and test sends in any language.

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How a Send Works

When a multilingual campaign starts, Lettr reads each recipient’s language property and matches it against the languages the template has:
  1. A contact with de gets the German version. A contact with de-AT or german gets it too. Matching is forgiving; see how values are matched.
  2. A contact with no value, or a value that matches no template language, gets the primary language. Everyone receives an email.
  3. Each recipient gets their language’s content, subject, sender and reply-to, an unsubscribe footer in the same language as the email, and a web version in that language too.
Content is locked in every language the moment you schedule or start the campaign. Editing or deleting the template afterwards does not change what goes out.

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Quick Start

1

Make the template multilingual

Open a marketing template in the editor and click Create mutation in the top bar. Add the language the template is written in first (it becomes the primary), then add each translation and translate its blocks by hand or with AI. See Multilingual templates and Template translation.
2

Tell Lettr where each contact's language lives

Go to Audience → Properties, edit the property that holds the language, and tick Use as communication language. If your property is already named language, lang or locale, this step is optional. See Contact language.
3

Create the campaign

Link the template in the Compose step. The languages show up immediately. Optionally set a translated subject and sender per language. See Campaign setup.
4

Check the Review & Send panel

The Multi-language send panel shows how many recipients get each language and how many fall back to the primary language, with the values that did not match.
5

Send a test in each language, then send

The test email box has a language picker. After sending, the campaign detail page shows the same panel with final counts. See Sending and results.

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What Recipients Get

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Where It Fits

Multilingual campaigns build on three existing features. If you are new to any of them, read those pages first.

Templates

The visual editor where languages are added

Audience

Contacts and the custom properties they carry

Campaigns

The four-step campaign builder