Update from code changes: document mail replyTo and stricter validation - #406
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mintlify/6dc16288 - urBackend-frankfrut PR #406
September 11, 2026 05:18 — with 
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Summary
Documents the new optional
replyTofield and the tighter Zod validation now enforced byPOST /api/mail/sendandPOST /api/mail/send-batch.Changes
api-reference/mail/send.mdx: addedreplyToparam (single or array), expanded validation rules and the errors table with the new exact messages, addedreplyToto the direct-mode example.sdk/mail.mdx: addedreplyToto theSendMailPayloadtable and to the direct-mode example.guides/mail-platform.mdx: addedreplyToto the single-send schema; rewrote the/api/mail/send-batchschema to describe the strict per-item validation (1..100 items, per-recipient email validation, subject required,html/textrequired, no templates); refreshed the error reference rows for both endpoints with the new messages (Recipient list cannot be empty,Reply-to list cannot be empty,Subject is required,Provide html or text,Batch cannot be empty,Max 100 emails per batch); addedreplyToto the batch example and overview bullets.Context
Follows source PR geturbackend/urbackend#402 — "feat(mail): add replyTo support to sendMail and sendBatchMail".