---
segment: email
segment_kind: channel
question: "What is the best AI customer service agent for email?"
page_url: https://ai-agent.review/best-ai-agent-for-customer-service/email
record_url: https://ai-agent.review/best-ai-agent-for-customer-service/email.md
tested_performance: not-yet-tested
---

# What is the best AI customer service agent for email?

No agent is the best AI customer service agent for email, because nobody has tested them against each other. The best-evidenced are Lyro: an external source, not the vendor, reports each of them answering customers over email. 16 of the 22 agents reviewed have any published evidence for email; for the rest it is unknown, which means nobody has published it, not that the product cannot do it. Nothing here has been tested by this portal, so treat every name below as a shortlist to validate, not a winner.

## How these groups are formed

1. Agents are grouped by what the cited sources establish for this segment, not scored against each other.
2. An outside source reporting the product in this segment comes first, then the vendor's own documentation, then a documented limitation, then silence.
3. Within a group the order is alphabetical, because the evidence does not support ranking one against another.
4. No agent is dropped: the ones with nothing published are named too.

Groups are derived from the cited claims at build time and describe the evidence, not the products. Nothing here has been tested, so a higher group means more has been established about an agent in this segment, not that it performs better. An agent can be well suited to you and sit in the last group simply because nobody has written about it. Published review-site ratings do not order these groups either: where a record carries one it is cited on the profile, but those ratings score whole products against each other — one vendor's bundled chat widget against another's full help desk — and none of them measures the AI agent on its own.

## An outside source reports it serving this segment

A customer, analyst or journalist with no stake in the sale describes the product working here. This is the strongest evidence the portal holds, and it is still somebody else's deployment, not yours.

| Agent (A–Z) | Vendor | Evidence for this segment | What puts it here | Customer workflows with evidence |
| --- | --- | --- | --- | --- |
| [Lyro](https://ai-agent.review/agents/lyro.md) | Tidio | External report | [Tidio Live Chat and AI Chatbots reviews (Shopify App Store), review by Memas Dessert](https://apps.shopify.com/tidio-chat/reviews?page=15) | 2 externally reported, 1 vendor-documented, of 7 |

## The vendor documents this segment, and nobody else has written about it

The vendor says it serves this segment. That is a reasonable place to start a shortlist and it is not confirmation, because no independent source has reported on it either way.

Listed alphabetically. Position inside a group carries no meaning: these agents are not ranked against each other.

| Agent (A–Z) | Vendor | Evidence for this segment | What puts it here | Customer workflows with evidence |
| --- | --- | --- | --- | --- |
| [Ada](https://ai-agent.review/agents/ada.md) | Ada | Vendor-documented | [Key concepts (Ada docs)](https://docs.ada.cx/docs/welcome/key-concepts) | 0 externally reported, 7 vendor-documented, of 7 |
| [Breeze Customer Agent](https://ai-agent.review/agents/hubspot-breeze.md) | HubSpot | Vendor-documented | [AI Customer Service Agent — HubSpot](https://www.hubspot.com/products/artificial-intelligence/ai-customer-service-agent) | 0 externally reported, 2 vendor-documented, of 7 |
| [Crescendo](https://ai-agent.review/agents/crescendo.md) | Crescendo | Vendor-documented | [Crescendo — Concierge Agent](https://www.crescendo.ai/agents/concierge) | 2 externally reported, 1 vendor-documented, of 7 |
| [Decagon](https://ai-agent.review/agents/decagon.md) | Decagon | Vendor-documented | [Decagon homepage and linked customer examples](https://decagon.ai/) | 1 externally reported, 6 vendor-documented, of 7 |
| [Fin](https://ai-agent.review/agents/fin.md) | Intercom | Vendor-documented | [Fin AI Agent FAQs (Intercom Help)](https://www.intercom.com/help/en/articles/7837535-fin-ai-agent-faqs) | 0 externally reported, 7 vendor-documented, of 7 |
| [Forethought](https://ai-agent.review/agents/forethought.md) | Forethought (Zendesk) | Vendor-documented | [Forethought Solve](https://forethought.ai/solve/) | 3 externally reported, 0 vendor-documented, of 7 |
| [Freddy AI Agent](https://ai-agent.review/agents/freddy-ai.md) | Freshworks | Vendor-documented | [Freshdesk Pricing](https://www.freshworks.com/freshdesk/pricing/) | 0 externally reported, 0 vendor-documented, of 7 |
| [Gorgias AI Agent](https://ai-agent.review/agents/gorgias.md) | Gorgias | Vendor-documented | [Gorgias — AI teammate for customer experience](https://www.gorgias.com/) | 1 externally reported, 3 vendor-documented, of 7 |
| [Kore.ai](https://ai-agent.review/agents/kore-ai.md) | Kore.ai | Vendor-documented | [Channels - Kore.ai Agent Platform documentation](https://koreai.mintlify.app/agent-platform/channels.md) | 1 externally reported, 1 vendor-documented, of 7 |
| [PolyAI](https://ai-agent.review/agents/polyai.md) | PolyAI | Vendor-documented | [PolyAI Docs — documentation index (llms.txt)](https://docs.poly.ai/llms.txt) | 2 externally reported, 1 vendor-documented, of 7 |
| [Sierra](https://ai-agent.review/agents/sierra.md) | Sierra | Vendor-documented | [Channels (Sierra)](https://sierra.ai/product/channels) | 0 externally reported, 7 vendor-documented, of 7 |
| [Sprinklr](https://ai-agent.review/agents/sprinklr.md) | Sprinklr | Vendor-documented | [Sprinklr AI Agents](https://www.sprinklr.com/products/platform/ai-agents/) | 1 externally reported, 1 vendor-documented, of 7 |
| [Talkdesk](https://ai-agent.review/agents/talkdesk.md) | Talkdesk | Vendor-documented | [Talkdesk AI Agents / Multi-Agent Orchestration](https://www.talkdesk.com/contact-center-platform/ai-agents/) | 3 externally reported, 2 vendor-documented, of 7 |
| [Yellow.ai](https://ai-agent.review/agents/yellow-ai.md) | Yellow.ai | Vendor-documented | [Channel configuration overview (Yellow.ai docs)](https://docs.yellow.ai/docs/nexus/channelConfiguration/overview) | 0 externally reported, 2 vendor-documented, of 7 |
| [Zendesk AI Agents](https://ai-agent.review/agents/zendesk-ai-agents.md) | Zendesk | Vendor-documented | [Zendesk AI Agents product overview](https://www.zendesk.com/service/ai/ai-agents/) | 1 externally reported, 6 vendor-documented, of 7 |

## A limitation is documented for this segment

A cited source describes a limit or a bad experience here. It sits below vendor documentation because it is not evidence of fit, and above the agents nobody has written about because somebody at least looked. Read the condition: it may not apply to you at all.

No agent in the catalogue is in this group.

## Nothing published for this segment

No reviewed source places these agents here, by the vendor's own documentation or otherwise. That is a gap in the public record, not a finding against the products, and several of them may suit you.

Listed alphabetically. Position inside a group carries no meaning: these agents are not ranked against each other.

- [Agentforce](https://ai-agent.review/agents/agentforce.md)
- [Five9](https://ai-agent.review/agents/five9.md)
- [Genesys Cloud CX](https://ai-agent.review/agents/genesys-cloud-cx.md)
- [LivePerson](https://ai-agent.review/agents/liveperson.md)
- [NiCE Cognigy](https://ai-agent.review/agents/nice-cognigy.md)
- [NiCE CXone](https://ai-agent.review/agents/nice-cxone.md)

## Every claim behind these groups

### Lyro — External report

- Tidio documents Lyro answering on the website chat widget by default, and optionally on Facebook Messenger, Instagram and WhatsApp once those are integrated with Tidio, and on incoming email tickets from connected mailboxes. _(Vendor-reported, checked 3 Oct 2026; source: [Lyro - the conversational AI agent (Tidio Help Center)](https://help.tidio.com/hc/en-us/articles/9003475527196-Lyro-the-conversational-AI-agent); claim id: `lyro-cmp-channels`)_
- A German merchant wrote that Lyro answers their emails, social media messages and website live chats. _(Independent report, published 6 Dec 2025, checked 3 Oct 2026; source: [Tidio Live Chat and AI Chatbots reviews (Shopify App Store), review by Memas Dessert](https://apps.shopify.com/tidio-chat/reviews?page=15); claim id: `lyro-strength-channels-merchant`)_

### Ada — Vendor-documented

- Chat, voice, email and social messaging are documented. Voice and social connections use supported external platforms; confirm the intended channel integration. _(Vendor-reported, checked 20 Sept 2026; source: [Key concepts (Ada docs)](https://docs.ada.cx/docs/welcome/key-concepts); claim id: `ada-channels`)_

### Breeze Customer Agent — Vendor-documented

- HubSpot lists live chat, email, forms, WhatsApp, Facebook Messenger, and inbound voice calls as channels the agent can handle. _(Vendor-reported, checked 20 Sept 2026; source: [AI Customer Service Agent — HubSpot](https://www.hubspot.com/products/artificial-intelligence/ai-customer-service-agent); claim id: `hubspot-breeze-cmp-channels`)_

### Crescendo — Vendor-documented

- Crescendo states its Concierge agent handles "Voice, chat, email, SMS, WhatsApp" from a single AI layer, with a website chat widget, mobile apps and API access also documented. _(Vendor-reported, checked 20 Sept 2026; source: [Crescendo — Concierge Agent](https://www.crescendo.ai/agents/concierge); claim id: `crescendo-cmp-channels`)_

### Decagon — Vendor-documented

- Decagon’s homepage lists chat, email and voice. SMS appears in its Curology customer story; confirm whether that channel is available for your proposed deployment. _(Vendor-reported, checked 20 Sept 2026; source: [Decagon homepage and linked customer examples](https://decagon.ai/); claim id: `decagon-channels`)_

### Fin — Vendor-documented

- The FAQ lists web and mobile Messenger, email, WhatsApp, SMS, Facebook, and Instagram. Confirm separate voice or other channel access and feature coverage for the intended deployment. _(Vendor-reported, checked 20 Sept 2026; source: [Fin AI Agent FAQs (Intercom Help)](https://www.intercom.com/help/en/articles/7837535-fin-ai-agent-faqs); claim id: `fin-channels`)_

### Forethought — Vendor-documented

- The vendor lists chat, email, voice, SMS, Slack, mobile apps and a headless API as supported channels. _(Vendor-reported, checked 20 Sept 2026; source: [Forethought Solve](https://forethought.ai/solve/); claim id: `forethought-channels`)_

### Freddy AI Agent — Vendor-documented

- The only channel named in the AI Agent rows of Freshworks' published plan comparison is email, described as an Email AI Agent that engages in back-and-forth replies, responds with the right resolution, and captures feedback. _(Vendor-reported, checked 20 Sept 2026; source: [Freshdesk Pricing](https://www.freshworks.com/freshdesk/pricing/); claim id: `freddy-ai-channels`)_

### Gorgias AI Agent — Vendor-documented

- Gorgias states the AI Agent operates in its omnichannel inbox covering email, chat, SMS, WhatsApp, Instagram and Facebook. _(Vendor-reported, checked 20 Sept 2026; source: [Gorgias — AI teammate for customer experience](https://www.gorgias.com/); claim id: `gorgias-cmp-channels`)_

### Kore.ai — Vendor-documented

- Kore.ai's channel documentation lists digital channels (Slack, LINE, Microsoft Teams, WhatsApp, Messenger, Twilio SMS, Telegram, Zendesk, Instagram, Genesys, Genesys Open Messaging, Email), voice channels (Realtime LLM Voice, Pipeline Voice, VXML IVR, Genesys Audio Connector, AudioCodes), SDK channels (Web SDK, API, Mobile SDK), webhooks, and the AG-UI and Agent-to-Agent protocols. _(Vendor-reported, checked 20 Sept 2026; source: [Channels - Kore.ai Agent Platform documentation](https://koreai.mintlify.app/agent-platform/channels.md); claim id: `kore-ai-cmp-channels`)_

### PolyAI — Vendor-documented

- PolyAI is voice-first — its documentation calls it an "enterprise platform for building voice and chat agents" and its pricing is per minute of voice-agent use — with secondary documented channels covering web chat, SMS and RCS, email, and iOS/Android SDKs (including in-app voice calling). _(Vendor-reported, checked 20 Sept 2026; source: [PolyAI Docs — documentation index (llms.txt)](https://docs.poly.ai/llms.txt); claim id: `polyai-cmp-channels`)_

### Sierra — Vendor-documented

- Vendor-listed channels include phone, website and app chat, WhatsApp, Apple Business Chat, SMS and email. Live Assist supports staff, and Sierra also documents publishing selected agent journeys to ChatGPT. _(Vendor-reported, checked 20 Sept 2026; source: [Channels (Sierra)](https://sierra.ai/product/channels); claim id: `sierra-channels`)_

### Sprinklr — Vendor-documented

- Sprinklr states AI agents operate across "chat, social, voice, messaging, email, and more", moving between voice, chat, email and social while retaining conversation context. _(Vendor-reported, checked 20 Sept 2026; source: [Sprinklr AI Agents](https://www.sprinklr.com/products/platform/ai-agents/); claim id: `sprinklr-channels`)_

### Talkdesk — Vendor-documented

- Talkdesk says its AI agents connect interactions across voice, digital, email and web, and describes Autopilot as resolving requests across voice and digital channels. _(Vendor-reported, checked 20 Sept 2026; source: [Talkdesk AI Agents / Multi-Agent Orchestration](https://www.talkdesk.com/contact-center-platform/ai-agents/); claim id: `talkdesk-cmp-channels`)_

### Yellow.ai — Vendor-documented

- Documentation lists 24 configurable channels including WhatsApp, web widget, email, SMS, Instagram, Facebook Messenger, Microsoft Teams, Slack, Telegram, Viber, Line, Zalo, Apple Business Chat and Google Business Messages, while the pricing page markets 35 or more channels on paid tiers. _(Vendor-reported, checked 20 Sept 2026; source: [Channel configuration overview (Yellow.ai docs)](https://docs.yellow.ai/docs/nexus/channelConfiguration/overview); claim id: `yellow-ai-cmp-channels`)_

### Zendesk AI Agents — Vendor-documented

- Zendesk advertises web, mobile, social, email, and voice. Check channel-specific documentation and availability for the selected agent. _(Vendor-reported, checked 20 Sept 2026; source: [Zendesk AI Agents product overview](https://www.zendesk.com/service/ai/ai-agents/); claim id: `zendesk-cmp-channels`)_

Method: https://ai-agent.review/methodology#shortlists