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Shortlist by channel

What is the best AI customer service agent for email?

No independent source establishes any agent in this catalogue as answering customers over email. Ada, Breeze Customer Agent and Crescendo document it in their own material, which is where a shortlist starts rather than where it ends. 15 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.

All shortlists · Markdown record · How this is grouped

An outside source reports it serving this segment

External report0 of 22

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.

No agent in the catalogue is in this group.

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

Vendor-documented15 of 22

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.

The vendor documents this segment, and nobody else has written about it, for email
AgentWhat puts it hereCustomer workflows with evidence
AdaAda0 externally reported, 7 vendor-documented, of 7
Breeze Customer AgentHubSpot0 externally reported, 2 vendor-documented, of 7
CrescendoCrescendo2 externally reported, 1 vendor-documented, of 7
DecagonDecagon1 externally reported, 6 vendor-documented, of 7
FinIntercom0 externally reported, 7 vendor-documented, of 7
ForethoughtForethought (Zendesk)3 externally reported, 0 vendor-documented, of 7
Freddy AI AgentFreshworks0 externally reported, 0 vendor-documented, of 7
Gorgias AI AgentGorgias1 externally reported, 3 vendor-documented, of 7
Kore.aiKore.ai1 externally reported, 1 vendor-documented, of 7
PolyAIPolyAI2 externally reported, 1 vendor-documented, of 7
SierraSierra0 externally reported, 7 vendor-documented, of 7
SprinklrSprinklr1 externally reported, 1 vendor-documented, of 7
TalkdeskTalkdesk3 externally reported, 2 vendor-documented, of 7
Yellow.aiYellow.ai0 externally reported, 2 vendor-documented, of 7
Zendesk AI AgentsZendesk1 externally reported, 6 vendor-documented, of 7

A limitation is documented for this segment

Caveat documented0 of 22

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

Not established7 of 22

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.

Every claim behind these groups

Each agent above with evidence for email, and the claims that placed it, with the source type and the date it was checked.

  • 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
      Source
      Key concepts (Ada docs)
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. Claim ID ada-channels

  • Breeze Customer Agent

    Vendor-documented

  • 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
      Source
      Crescendo — Concierge Agent
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. Claim ID crescendo-cmp-channels

  • Decagon

    Vendor-documented

  • 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
      Source
      Fin AI Agent FAQs (Intercom Help)
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. 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
      Source
      Forethought Solve
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. 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
      Source
      Freshdesk Pricing
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. Claim ID freddy-ai-channels

  • Gorgias AI Agent

    Vendor-documented

  • 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
      Source
      Channels - Kore.ai Agent Platform documentation
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. 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
      Source
      PolyAI Docs — documentation index (llms.txt)
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. 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
      Source
      Channels (Sierra)
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. 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
      Source
      Sprinklr AI Agents
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. Claim ID sprinklr-channels

  • Talkdesk

    Vendor-documented

  • 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
      Source
      Channel configuration overview (Yellow.ai docs)
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. 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
      Source
      Zendesk AI Agents product overview
      Checked
      History
      First published
      Correct this
      Request a correction with a public source. Claim ID zendesk-cmp-channels

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.

The methodology page explains why the portal groups evidence rather than scoring products.

Other shortlists

Facts last checked . No agent on this page has been tested by this portal.