Transactional Email Service | API Email System

The types of automated emails we take care of

Different transactional emails and bulk marketing campaigns are the most common ways to use our robust email API.

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Abandoned cart emails

Increase your sales by reminding customers you still have something special for them.

Promotional emails

Encourage your subscribers to new purchases with catchy offers.

Validation and password recovery emails

Build solid and reliable connections with your audience.

Order confirmation emails and receipts

Deliver crucial messages instantly and monitor recipients' activity with real-time event logs.

Wishlist and product recommendation emails

Get more upsales with a personalized approach.

Customer feedback and survey emails

Make the most of your clients’ opinions to get even more of their love.

Our Features for Your Successful Email Campaigns

Competitive Pricing

Get everything you need for sending transactional emails and promo campaigns at lower costs.

Proven Expertise

We deliver billions of emails annually, and 99,88% reach their destinations successfully.

Being Data-Driven Is Easy

Enjoy instant event notification via webhooks, visual dashboards, and CSV data export for up to 100 days’ period.

Email Templates

40+ ready-to-go examples, visual drag-and-drop builder, and AI-powered HTML editor.

Independent Projects

Group email campaigns by types, topics, or senders, having an individual environment for each.

Reputation Management

Email validation API and dedicated IPs will skyrocket your deliverability.

Effortless Сonnectivity

Send emails flawlessly with our robust Web API, easy-to-go SMTP API, and ready-to-use integrations.

Custom Tracking Domains

Brand the tracking links for free to get the best credibility, or use a white label model.

Book consultation

Why UniOne?

That’s a fairly personal question, but we’re glad you asked

	UNIONE	Mailgun	Sendgrid	Mailchimp Transactional
Free trial	6000 emails/month for 4 months	Up to 2.5M, but for 1 month only	100 emails/day forever (3,000 emails/month)	No
Minimum price per 1k emails at basic tariffs / custom tariffs	$0.22 / $0.07	$0.35 / $0.08	$0.47 / $0.17	$0.4 + minimum $20/month for 500 contacts Standard plan
Customer support	24/7 in live chat and via email for everybody, on all pricing plans	Support tickets (response time about 24 hours), Chat between 7 am to 7 pm CST, Monday to Friday (for pricing plans starting at $80), Phone between 8 am to 5 pm CST, Monday to Friday (for pricing plans starting at $90)	Ticket support 24/7 (for logged in users only), chat support 24/7 (for paying customers), callback between 7 AM to 5 PM MT (for Pro or higher accounts)	24/7 email & chat support at paid "Standard" plans only, or Email support for first 30 days
Transactional and bulk emails via SMTP and REST API	Yes	Yes	Yes	Yes
Independent tags for statistics	up to 4 per email, up to 10,000 per project + filtering through several categories	up to 3 per email, up to 5,000 per domain + filtering through 1 category only	up to 10 per email, up to 100 per domain (recommended) + filtering through 1 category only	up to 100 per email, up to 1,000 per account
Custom tracking domain and unsubscribe link	Yes	Partially	Partially	Yes
White Label	Yes	Yes	Partially	Partially
User-friendly Email Builder with ready-to-use templates	Yes, + AI-driven HTML editor	Yes	Yes	Partially
Dedicated IPs	Yes	Yes	Yes	Yes
Custom and default unsubscribe link	Yes	No	No	Yes
Setting up	Less than 1 minute to sign up - no credit card or long-form completion is required. Send the first email in less than 15 minutes (may take more time depending on the domain authentication process)	Signing up takes 5 to 10 minutes. Credit card is an option, and you should fill in some extra fields, such as your company name, at the first step. Sending the first test email may take about 30 minutes on average (may take more time depending on the domain authentication process)	Signing up takes about 20-30 minutes - you should set up a 2FA and fill in a questionnaire. Sending the first test email will take about 30-40 minutes in total since you can verify the single sender only, not the whole sending domain. Yet, to get access to the full functionality, you'll need to spend another 20 minutes or more on the domain authentication	Signing up takes 5 to 10 minutes - you should choose the expected pricing plan first. You can't send a single transactional test email unless you pay at least $20 for 1 block of them

More comparisons

Free trial
UNIONE	6000 emails/month for 4 months
Mailgun	5000 emails for 1 month (only)
Sendgrid	100 emails/day forever (3000 emails/month)
Mailchimp Transactional	No

Minimum price per 1k emails at basic tariffs / custom tariffs
UNIONE	$0.22 / $0.07
Mailgun	$0.5 / $0.08
Sendgrid	$0.5 / $0.17
Mailchimp Transactional	$0.4 + minimum $20/month for 500 contacts Standard plan

Customer support
UNIONE	24/7 in live chat and via email for everybody, on all pricing plans
Mailgun	Support tickets (response time about 24 hours), Chat between 7am to 7pm... More detailed
Sendgrid	Ticket support 24/7 (for logged in users only), chat support 24/7 (for paying... More detailed
Mailchimp Transactional	24/7 email & chat support at paid "Standard" plans only, or Email support for first 30 days

Transactional and bulk emails via SMTP and REST API
UNIONE	Yes
Mailgun	Yes
Sendgrid	Yes
Mailchimp Transactional	Yes

Independent tags for statistics
UNIONE	up to 4 per email, up to 10000 per project + filtering through several categories
Mailgun	up to 3 per email, up to 5000 per domain + filtering through 1 category only
Sendgrid	up to 10 per email, up to 100 per domain (recommended) + filtering through 1 category only
Mailchimp Transactional	up to 100 per email, up to 1000 per account

Custom tracking domain and unsubscribe link
UNIONE	Yes
Mailgun	Partially
Sendgrid	Partially
Mailchimp Transactional	Yes

White Label
UNIONE	Yes
Mailgun	Yes
Sendgrid	No
Mailchimp Transactional	No

FAQ

What makes transactional emails so specific and distinguished from other emails sent in bulk?

Transactional emails are essential for delivering timely and personalized information triggered by user actions, such as password resets, order confirmations, and notifications. Bulk emails, on the other hand, are typically used for marketing purposes and do not offer the same level of personalization and immediacy. Using transactional emails ensures higher engagement and compliance with email regulations.

Why should I use a specialized transactional email provider for these messages?

Compared to other bulk email providers, free, or custom SMTP servers, transactional email services prioritize the deliverability and speed required for transactional emails.UniOne is specifically designed to handle transactional emails, ensuring they reach recipients promptly and reliably, with robust tracking and monitoring features to maintain high deliverability rates.

How do I start with UniOne? What do I need to set up?

Getting started with UniOne is simple. Sign up for an account, verify your domain, integrate our API with your application using our comprehensive documentation and SDKs, and start using the service. Our support team is available to assist you throughout the process to ensure a smooth setup.

Can I customize the content and design of my transactional emails?

Absolutely! Our platform provides a user-friendly editor with 40+ ready-to-go examples for creating and customizing email templates. You can fully personalize the content, layout, and design using our drag-and-drop or HTML editor to match your brand's look and feel.

Why should I pay for a service when there are free SMTP servers?

While free SMTP servers can be useful for basic needs, they often lack the reliability, speed, and advanced features required for high-quality transactional emails. UniOne offers high deliverability, detailed analytics, and robust security measures, ensuring your emails reach the inbox and comply with industry standards. Investing in a dedicated service of UniOne provides peace of mind and professional support.

Do I need a dedicated IP?

It’s optional. A dedicated IP can be beneficial for maintaining a strong sender reputation, especially if you send a high volume of emails. It ensures that your email deliverability is not affected by the actions of other users. UniOne offers dedicated IP options to help you maintain control over your email sending reputation and achieve consistent deliverability.

What is the email deliverability rate and the delivery time for large-volume transactional emails?

At UniOne, we ensure a high email deliverability rate of 99.88% for all transactional emails, including large-volume.We deliver transactional emails to recipients' inboxes in several seconds. This ensures that all your critical notifications are received exactly when needed, providing timely and reliable communication.

How do you handle security and compliance for sensitive user data?

Security and compliance are top priorities for us. Our service is designed with 4 layers of security to protect sensitive user data. We are compliant with major regulations, including GDPR and US CAN-SPAM. All data is encrypted in transit and at rest, UniOne consistently incorporates "privacy by design" principles in its proactive product development efforts.

The еmail delivery system you can rely on

Proven recognition

The types of automated emails we take care of

Abandoned cart emails

Promotional emails

Validation and password recovery emails

Order confirmation emails and receipts

Wishlist and product recommendation emails

Customer feedback and survey emails

Friendly support to assist in your email journey

Great support as a standard

Our customers

Why businesses choose us?

Our Features for Your Successful Email Campaigns

GDPR Compliance and Personal Data Protection

We have legal entities in the EU and US

Why UniOne?

FAQ

UNIONE