You can configure which languages you expect messages to be written in.

• This helps Letterbox's spam detection avoid penalising legitimate messages in non-English languages.
• Without this setting, messages in certain languages may receive a higher spam score.
• Setting expected languages lets Letterbox know those languages are normal for your form.

How it works

• Letterbox analyses the language of each incoming message.
• If the detected language matches one of your expected languages, no language penalty is applied.
• If the language does not match, the message may receive a higher spam score.

Language format

• Languages are specified as ISO 639-1 codes (two lowercase letters).
• For example: en for English, es for Spanish, fr for French, de for German.
• Multiple languages can be specified as a comma-separated list, e.g. en,es,fr.
• Use the special value any to accept all languages and disable language-based spam scoring.

Restrictions

• A maximum of 10 languages can be specified.
• Codes must be valid ISO 639-1 language codes.

Configure expected languages

• In your profile, under a contact form, find the expected languages setting.
• Enter your expected language codes separated by commas, or enter "any" to accept all.
• Save the changes. The language setting takes effect for new messages immediately.

Further steps

• Custom email subject line ⇨
• Custom redirect URLs ⇨

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