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An OTP that arrives in ninety seconds is a failed login. A receipt in spam is a support ticket. Transactional email — the messages your application sends automatically — has different requirements from marketing email, and running both through the same pipe damages the one that must not fail.
Why they must be separated
- Reputation contamination — marketing sends generate complaints and unsubscribes; sharing infrastructure means those complaints drag down OTP deliverability too.
- Speed — a password reset is useless in five minutes. Transactional infrastructure is built for seconds.
- No unsubscribe problem — a customer can opt out of marketing; they cannot opt out of their own receipts. Mixing the streams confuses this.
The options
Zoho ZeptoMail is built exclusively for transactional mail — OTPs, receipts, alerts, password resets — with sending isolated from any marketing traffic. That isolation is the entire point of the product.
Marketing sends belong in Zoho Campaigns, on its own reputation, and ordinary human correspondence in Zoho Mail. Three streams, three tools, and a problem in one no longer poisons the others.
Read our full ZeptoMail breakdown — sending model, template handling and integration.
Setup that actually determines deliverability
Authenticate a subdomain (for example mail.yourdomain.com) with its own SPF, DKIM and DMARC records, and send transactional mail from it. This isolates reputation, keeps your root domain clean, and gives you a clear signal in reporting. Skipping authentication is the single most common reason OTPs land in spam — before volume, before content, before anything else.
Who needs this
Any business whose application or website sends automated mail: booking confirmations, order receipts, login codes, payment notifications. If a human wrote it, it is correspondence. If your system wrote it, it is transactional, and it deserves its own pipe.
See the full range: Zoho for UAE business.