Introduction to Transactional Emails

Transactional emails

Transactional emails are automated emails usually triggered by a user action on a website or an application. The recipient is actively seeking this email. These emails consist of sensitive information based on user behaviour on a website or an app. Non-delivery of your transactional emails can impact your customers and your business. You can view the examples of transactional emails below:

  • Account Creation - User invites, account activation emails, password reset emails, log-in attempt notification.

  • Billing Information - Information about credit card payments, addition and deletion of beneficiaries, sending OTPs or information related to electronic fund transfers.

  • Payroll systems - Payslip and salary information.

  • Payments - Purchase receipts, refund emails, confirmation messages, cancellation messages, payment subscription emails, abandoned cart emails, invoices, payment failure or subscription renewal emails.

  • Notifications - Trial expiration emails, account-reactivation emails, account deactivation emails, privacy policy updates, new sign-in messages, account deletion messages or other account-related notifications.

Bulk Emails

Bulk emails are emails sent to a large group of recipients at once. The user is not actively looking for bulk emails i.e., these emails are not triggered by user actions on a website or an application.  Marketing emails, Promotional emails, Email Announcements, and Newsletters are examples of bulk emails.

Bulk Emails vs Transactional Emails

Bulk EmailsTransactional Emails
Sent to a large group of recipients (contacts, subscribers, downloaded or bought email lists) at once Triggered by a user action on a website or an application
They can be unsolicited emails tooRecipient is actively seeking these emails
May land in user's promotional or spam folderThey are delivered to the recipient's inbox
Eg., Newsletters, marketing emails.Eg., Account activation emails, password reset emails, OTPs. 

If you are looking for a bulk email provider, you can visit Zoho Campaigns.

What is Zoho ZeptoMail?

ZeptoMail by Zoho Mail is a dedicated email sending service to send transactional emails (like welcome mailers, payment receipts, invoices, OTPs, alert emails). These are important emails that must reach the customer inbox and not their spam folder. ZeptoMail ensures to provide timely inbox delivery and authentic email delivery:

  • Timely inbox delivery - ZeptoMail uses IPs (Internet Protocol) with a high reputation to send emails. ISPs (Internet Service Providers) trust emails from high reputation IPs and deliver them to the recipient's inbox.
  • Authentic email delivery - Recipients trust emails from genuine domains. So it is mandatory to add and verify your domains in ZeptoMail before sending transactional emails. This prevents the flagging of emails as spam and ensures email authenticity.

Why are Bulk Emails not allowed in ZeptoMail?

Allowing bulk emails will reduce ZeptoMail's IP reputation. ISPs and ESPs do not trust the emails sent by low reputation IPs. So these emails are likely to land in the recipient's spam folder. This will impact timely inbox delivery.


If you are an existing user of any of the Zoho applications like Zoho CRM, Zoho Books, Zoho Desk, etc., there is no need for you to separately connect ZeptoMail with your Zoho Application(s). All emails sent by Zoho Applications are powered by ZeptoMail.