Delphi Cloud Postbox

A fault-tolerant service for sending emails that takes on mailing infrastructure setup, support for up‑to-date communication protocols, and compliance with all email authentication standards.

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A managed service

Ready-made infrastructure for setting up and sending emails in compliance with all email authentication standards: DMARC, DKIM, SPF.

Secure newsletters

Emails are sent in Delphi Cloud infrastructure, in compliance with the requirements of Indian Federal Law №152 (UZ-1), ISO standards, PCI DSS, and ISO R 57580, using a secure connection version TLS 1.2 and higher.

Different delivery methods

Easy integration of Delphi Cloud Postbox into other applications using SMTP protocol or AWS SES‑compatible API for sending emails.

Email deliverability 99.9%

Reputation and blacklist monitoring, automatic delivery restarts after recipient-side failures.

Accessible analytics

Integration with Delphi Cloud Logging to aggregate and view logs, with Delphi Monitoring to track the message send and delivery dynamics, and with Delphi DataLens to build dashboards and analytics.

Any scale

Send up to 10 M emails a day. The median time to send an email is less than three seconds.

2000 emails a month for free

A special pricing policy is available for the service, with the first 2000 emails provided free of charge each month. After that, the cost depends on the number of emails sent each month.

Transactional email use cases

Registration and authorization

Registration confirmation, password recovery, account login notifications, one-time login codes.

Feedback and support

Support ticket confirmation, service quality evaluations.

Status notifications

Notifications for delivery, status changes for orders or requests. Payment and subscription confirmation.

Financial operations

Sending electronic receipts, invoices, or debit notifications.

Event notifications

Reminders about events, change notifications.

Education and training

Emails with access to materials and test results.

Logistics and delivery

Sending tracking numbers, address changes, and other details.

Security

Notifications of suspicious activity, account change confirmations.

Getting started

Create addresses and set up message sending.

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FAQ

Transactional, or service emails, are messages that are sent automatically as a result of certain user actions and that contain important information for them. These include notifications, reminders, and messages related to purchases.

Yes. Typical newsletters are sent manually with a certain regularity in order to increase sales or strengthen customer relationships.
Transactional emails confirm customer actions on the site or provide them with details about their order. They are sent automatically as part of the service process. Customers initiate the sending of these messages themselves, so they are more likely to open them compared to other newsletters. Such emails should arrive quickly and not end up in the Spam folder.

There are emails that are immediately rejected by the receiver. As a rule, they contain a link or ID for contacting the support team of the receiving service.
As for emails that are accepted but still end up in the Spam folder, then there are multiple factors at play — you should work on the email’s contents, e.g., so that it does not contain links to third-party resources. In addition, diversion to the Spam folder depends on whether the recipient has previously received such emails, opened them, replied to them, etc. There is no universal advice.

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