For years, Zoho ZeptoMail has been the transactional email platform developers and businesses relied on for password resets, order confirmations, shipping alerts, OTPs, and other messages that keep a product running every minute of the day. ZeptoMail has now evolved into Zoho CPaaS (Communication Platform as a Service), a multi-channel communication platform covering Email, SMS, WhatsApp, and Voice, on the same foundation but with significantly more reach.
Zoho has spent the last few years building the compliance, deliverability, and infrastructure layer that makes a genuine CPaaS worth using: sender reputation management, suppression list enforcement, bounce handling, and SPF/DKIM/DMARC authentication. That discipline, built rigorously for email, has now been applied to every new channel added to the platform.
Each channel has its own purpose-built API, designed for the specifics of that medium rather than forced through one generic interface. What's shared underneath is the console, the analytics, the compliance controls, and a credit-based pricing model letting you pay for usage across all four channels from one place.
Built for OTPs, alerts, and other time-sensitive notifications. Handles DLT compliance requirements, which vary and are mandatory across different regions, with template management, delivery tracking, and sender ID configuration built in.
Sends notifications through the official WhatsApp Business API, covering order updates, appointment reminders, delivery alerts, and verification messages on a channel customers are already using. Template approval workflows, media message support, and delivery status tracking are all included.
Automated voice calls for scenarios where a text notification isn't enough, such as OTPs, critical alerts, verification flows, and callback triggers, built for programmable outbound calls with call status tracking and customisable audio delivery.
Everything already familiar from ZeptoMail: high-deliverability transactional email, SMTP relay, dedicated IPs, an Agent model for clean message segmentation, and robust authentication support, now part of a broader platform rather than a standalone product.
Communication has become more complex: AI-powered products send notifications autonomously, and customer journeys move across channels within a single session, so reaching a user on the right channel at the right moment matters more than it did when email was the only option. Zoho CPaaS is built for that environment, a platform developers can integrate cleanly, businesses can trust for compliance, and AI workflows can consume as a communication layer, without stitching together multiple vendor relationships or managing separate deliverability setups per channel.
The four-channel foundation is live today, with each channel's capabilities set to deepen over time, alongside further channels being added to the platform. Zoho has also indicated it's building toward AI-driven workflows becoming a natural part of business communication, not by becoming an orchestration or agent-building layer itself, but by making CPaaS the communication platform AI agents reach for.
Documentation for all four channels is available in the Zoho CPaaS developer docs.