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The еmail delivery system you can rely on

We offer cost-effective API for sending transactional and marketing emails.
Integrate it once, and let us take care of the rest.
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Update 58 has been released: "To," "CC," and "BCC" headers in the Web API, DMARC record in the domain authentication settings.

Proven recognition

At UniOne, we work round-the-clock to provide our customers with friendly and responsive support for their excellent email delivery experience.
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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.

Friendly support to assist in your email journey

95% customer happiness rating
95%

Great support as a standard

95% customer happiness rating
24х7 customer support available in the live chat and via email
4 languages are already supported, and we are working on more
5 minutes average response time
30 minutes or less to address a request

Our customers

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Why businesses choose us?

Verified Reviewer
January 18, 2023
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Verified Reviewer
January 19, 2023
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Krishna T.
January 19, 2022
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Krishna M.
January 18, 2023
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Mariia L.
January 19, 2022
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Raviteja A.
January 19, 2022
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Kyrylo M.
January 19, 2023
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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.
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GDPR Compliance and Personal Data Protection

The safety of your data is the top priority for us. Thus, we do not store any personal and sensitive information on our servers. UniOne just processes the request to send the email and provides the statistics.
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We have legal entities in the EU and US

At UniOne, we’re flexible in payment methods and terms of customer service. We support all the most common credit and debit cards and provide the option of post-payment via the Contract and bank transfers.
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Meet our CTO & Co-Founder
Alexey

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

So why do I need service emails and why can't I use bulk mail instead?
That’s a good question. Service emails are personal messages that the recipient expects to receive. Usually, the receipt of a service email is triggered by some specific action on the customer’s part and serves as an instant response to that action. The main difference between bulk distributions, which are promotional in most cases, and service emails is that service emails are sent one-to-one and relate to specific customers in specific situations.
I already have a bulk email distribution provider, why can’t I send service emails via his service?
That’s a good question. Service emails are personal messages that the recipient expects to receive. Usually, the receipt of a service email is triggered by some specific action on the customer’s part and serves as an instant response to that action.
How do I start with UniOne? What do I need?
That’s a good question. Service emails are personal messages that the recipient expects to receive.
There are a lot of free SMTP servers that I can use.
Why should I pay for a specific service?
That’s a good question. Service emails are personal messages that the recipient expects to receive. Usually, the receipt of a service email is triggered by some specific action on the customer’s part and serves as an instant response to that action. The main difference between bulk distributions, which are promotional in most cases, and service emails is that service emails are sent one-to-one and relate to specific customers in specific situations.
But I can still set up a personal SMTP-server, right?
The main difference between bulk distributions, which are promotional in most cases, and service emails is that service emails are sent one-to-one and relate to specific customers in specific situations.
Do I need a dedicated IP?
That’s a good question. Usually, the receipt of a service email is triggered by some specific action on the customer’s part and serves as an instant response to that action. The main difference between bulk distributions, which are promotional in most cases, and service emails is that service emails are sent one-to-one and relate to specific customers in specific situations.

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