Mails.so

Validate every email address your AI agent collects, instantly

Before a lead enters your CRM or mailing list, your AI agent verifies their email through Mails.so's validation API. Invalid addresses get caught during the conversation, not after your bounce rate spikes. Clean data from the first interaction, every time.

Chosen by 800+ global brands across industries

Real-time email hygiene built into chat

Your AI agent validates individual emails on the spot and runs bulk verification jobs, ensuring every address your business collects is deliverable.

Mails.so

Use Cases

Clean data from every conversation

See how AI agents use real-time email validation to protect your sender reputation and ensure every lead is worth pursuing.

Lead Capture with Built-in Verification

A prospect fills out details through your AI chatbot. As soon as they type their email, the agent validates it through Mails.so in real time. If the address is invalid or a known disposable domain, the agent politely asks for a different one. Your CRM only receives verified leads. Your sales team never wastes time on unreachable contacts.

Pre-Campaign List Cleaning via Conversation

Your marketing team tells the agent to validate a batch of 500 subscriber emails before a product launch campaign. The agent submits the list to Mails.so's bulk API, waits for processing, and returns a summary: 478 valid, 15 risky, 7 invalid. Your team removes the bad addresses before hitting send, protecting your domain reputation.

Signup Form Fraud Prevention

Bots are submitting fake emails through your registration flow. Your AI Agent validates each email at the point of collection, rejecting disposable and invalid addresses in real time. Free email providers get flagged for additional verification. Spam registrations drop dramatically without adding CAPTCHAs or friction for legitimate users.

Try
Mails.so

Mails.so

FAQs

Frequently Asked Questions

How does the AI agent validate emails in real time during conversations?

When a visitor provides their email, the agent calls Mails.so's Validate Single Email API endpoint before proceeding. The response includes deliverability status, domain validity, MX record checks, and whether the address is disposable or free. This happens in under a second, so the conversation flow is not interrupted.

What happens if the email fails validation?

You configure the behavior in your agent settings. Options include politely asking for a different email, explaining that the address appears invalid, or accepting it with a warning flag. For common typos like 'gmial.com', the agent can suggest the correction 'gmail.com' and ask the user to confirm.

Can the agent handle bulk email list validation?

Yes. The agent submits up to 1,000 emails per batch using the Validate Bulk Emails endpoint. Since bulk processing is asynchronous, the agent monitors the job status and retrieves results via the Retrieve Batch Results endpoint when the validation completes.

Does Tars store the email addresses it validates?

No. Tars passes email addresses to Mails.so's API in real time and receives validation results. The addresses are used only within the active conversation context. Tars does not maintain a separate database of validated emails.

How accurate is the email validation?

Mails.so checks MX records, SMTP connectivity, domain validity, and known disposable provider databases. The service returns a quality score per email. While no validation service can guarantee inbox delivery, Mails.so catches the vast majority of invalid, temporary, and unreachable addresses.

Does the validation slow down the chat experience?

Single email validation typically completes in under one second. The agent can validate while composing its next response, making the check nearly invisible to the user. Bulk validations run asynchronously and do not block the conversation.

Can I set different validation strictness levels for different use cases?

Yes. Configure your agent to accept free email providers for newsletter signups but require business domains for demo requests. Use the quality score threshold to determine whether an email passes or gets flagged. Different gambits can apply different validation rules.

How is this different from just checking email format with regex?

Regex only checks if an email looks structurally valid. Mails.so verifies that the domain exists, MX records are configured, the mailbox accepts mail, and the address is not disposable. An email like 'user@tempmail123.com' passes regex validation but fails Mails.so's deliverability check.

How to add Tools to your AI Agent

Supercharge your AI Agent with Tool Integrations

Don't limit your AI Agent to basic conversations. Watch how to configure and add powerful tools making your agent smarter and more functional.

Real results, real customers, real stories

“We're saving an average of 4,000+ calls a month.”
Implementing an Agent revolutionized our customer service channels and our service to Indiana business owners. We're saving an average of 4,000+ calls a month and can now provide 24x7x365 customer service️ along with our business services.
Lindsey Roark Mayes
Ex-Director of SOS IT (State of Indiana)
“Cutting down on staff needing to email back.”
Since our launch of Tars Agents, we've had more than 5k interactions with them from individuals on the website. We saw prospects interacting with the Agent regarding application timelines, tuition, curriculum, and other items that may come through an email. This provides another avenue of access to our team while cutting down on staff needing to email back.
Levi Eastwood
Marketing Director of UCI Merage School
“Powerful tool - and there's so much more still to explore!”
I love the flexibility of the TARS chatbot design tool. The ability to drop in a new gambit and easily de-link and re-link gambits before and after it saves HOURS of time lost if I had to regenerate from scratch. TARS stands out for its flexibility, consistent performance, and outstanding support.
Aaron Rittmaster
Founder
“I like the product.”
Takes those boring forms and allows you to make the collecting of customer information enjoyable for the user. It has a lot of value and I see the company constantly working on improving it.
Pierre Rattini
Director of Marketing
“Very responsive and supportive Team”
I love how supportive and responsive the team members are. The chatbots are not difficult to build once you have an idea of what you are doing, and this is so based on the backend work Tars has completed. Also, they are flexible to the clients' requests.
Keisha Cameron
Product Manager
“Easy for cooperation and open to agreement.”
One of the biggest qualities of TARS is their ability to truly understand their clients' needs. They took the time to thoroughly assess our requirements, offering valuable insights and recommendations that we hadn't even considered. This level of personalized attention made a significant difference in the success of our project.
Milica Petrovic
Customer Care Project Associate
“Great service”
The guys at Tars are so passionate about bots and maximum engagement. Tars is overall a great product with really nice people there to help me engage and automate conversations I would have otherwise missed.
Nigel Gosling
Health Coach
“Best in class for lead generation”
TARS is an essential tool within our lead gen strategy. I started to use it a couple years ago, and the platform evolved to focus on results. You can integrate your Google Analytics, Facebook Pixel, and AdWords conversion tag to track results and measure your campaign. You can also integrate with Zapier, which opens a lot of possibilities. Compared with static landing pages, we have seen an increase in conversions and more engagement.
Leonardo Wolff
Founder
“Very professional and cooperative”
Building an automated chat that our customers actually used and reduced calls amount.
Maryam Alhaddad
Customer Journey Designer
“Flexibility and good service”
Tars platform is very flexible, so you can do pretty much any flux you desire. Also integrates with any third party through APIs with a very simple and easy-to-use interface. Also tars team is great! Always at disposal and brings suggestions and solutions for any issue encountered during the process of building the chatbot.
Lucas Von Lachmann
Process Manager
“Deserved The title of the Best Chatbot of the Year”
If you are building chatbots, you cannot go wrong with TARS. I have been with this company since their beginning. Seen how they have grown. I have tested a lot of bots, but this one is still the best out there. We use WhatsApp a lot for our business. And what I like best is that I can have 1 chatbot for website and for my WhatsApp. I especially appreciate their support team as well. Whenever I am stuck, they quickly reply to my questions.
MJ Felix
Chairman
“Advanced integration, easy to use, and very customizable.”
This chatbot does everything from AI integration to complete customization and is excellent for lead conversion in most industries. I think the pre-formatted templates are an excellent boost to get started quickly. The team is also excellent.
Rachel Rowling
Chief Operating Officer
“The chatbot implementation has exceeded expectations!”
The implementation has delivered 24/7 customer support and is proving its value by reducing Contact center calls by around 5% in just four months of operation. Beyond enhancing the e-care experience, the chatbot is driving impressive business results, achieving a remarkable 20% month-on-month growth.
Victor Pereira
Customer Care and CX Manager
“We're saving an average of 4,000+ calls a month.”
Implementing an Agent revolutionized our customer service channels and our service to Indiana business owners. We're saving an average of 4,000+ calls a month and can now provide 24x7x365 customer service️ along with our business services.
Lindsey Roark Mayes
Ex-Director of SOS IT (State of Indiana)
“Cutting down on staff needing to email back.”
Since our launch of Tars Agents, we've had more than 5k interactions with them from individuals on the website. We saw prospects interacting with the Agent regarding application timelines, tuition, curriculum, and other items that may come through an email. This provides another avenue of access to our team while cutting down on staff needing to email back.
Levi Eastwood
Marketing Director of UCI Merage School
“Powerful tool - and there's so much more still to explore!”
I love the flexibility of the TARS chatbot design tool. The ability to drop in a new gambit and easily de-link and re-link gambits before and after it saves HOURS of time lost if I had to regenerate from scratch. TARS stands out for its flexibility, consistent performance, and outstanding support.
Aaron Rittmaster
Founder
“I like the product.”
Takes those boring forms and allows you to make the collecting of customer information enjoyable for the user. It has a lot of value and I see the company constantly working on improving it.
Pierre Rattini
Director of Marketing
“Very responsive and supportive Team”
I love how supportive and responsive the team members are. The chatbots are not difficult to build once you have an idea of what you are doing, and this is so based on the backend work Tars has completed. Also, they are flexible to the clients' requests.
Keisha Cameron
Product Manager
“Easy for cooperation and open to agreement.”
One of the biggest qualities of TARS is their ability to truly understand their clients' needs. They took the time to thoroughly assess our requirements, offering valuable insights and recommendations that we hadn't even considered. This level of personalized attention made a significant difference in the success of our project.
Milica Petrovic
Customer Care Project Associate
“Great service”
The guys at Tars are so passionate about bots and maximum engagement. Tars is overall a great product with really nice people there to help me engage and automate conversations I would have otherwise missed.
Nigel Gosling
Health Coach
“Best in class for lead generation”
TARS is an essential tool within our lead gen strategy. I started to use it a couple years ago, and the platform evolved to focus on results. You can integrate your Google Analytics, Facebook Pixel, and AdWords conversion tag to track results and measure your campaign. You can also integrate with Zapier, which opens a lot of possibilities. Compared with static landing pages, we have seen an increase in conversions and more engagement.
Leonardo Wolff
Founder
“Very professional and cooperative”
Building an automated chat that our customers actually used and reduced calls amount.
Maryam Alhaddad
Customer Journey Designer
“Flexibility and good service”
Tars platform is very flexible, so you can do pretty much any flux you desire. Also integrates with any third party through APIs with a very simple and easy-to-use interface. Also tars team is great! Always at disposal and brings suggestions and solutions for any issue encountered during the process of building the chatbot.
Lucas Von Lachmann
Process Manager
“Deserved The title of the Best Chatbot of the Year”
If you are building chatbots, you cannot go wrong with TARS. I have been with this company since their beginning. Seen how they have grown. I have tested a lot of bots, but this one is still the best out there. We use WhatsApp a lot for our business. And what I like best is that I can have 1 chatbot for website and for my WhatsApp. I especially appreciate their support team as well. Whenever I am stuck, they quickly reply to my questions.
MJ Felix
Chairman
“Advanced integration, easy to use, and very customizable.”
This chatbot does everything from AI integration to complete customization and is excellent for lead conversion in most industries. I think the pre-formatted templates are an excellent boost to get started quickly. The team is also excellent.
Rachel Rowling
Chief Operating Officer
“The chatbot implementation has exceeded expectations!”
The implementation has delivered 24/7 customer support and is proving its value by reducing Contact center calls by around 5% in just four months of operation. Beyond enhancing the e-care experience, the chatbot is driving impressive business results, achieving a remarkable 20% month-on-month growth.
Victor Pereira
Customer Care and CX Manager

Privacy & Security

We’ll never let you lose sleep over privacy and security concerns

At Tars, we take privacy and security very seriously. We are compliant with GDPR, ISO, SOC 2, and HIPAA.

GDPR
ISO
SOC 2
HIPAA

Still scrolling? We both know you're interested.

Let's chat about AI Agents the old-fashioned way. Get a demo tailored to your requirements.

Schedule a Demo