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Email & Communication APIs · 3 APIs

Automated Email Analysis & Reply Generation AI APIs

Email intelligence APIs for priority scoring, sentiment analysis, smart reply generation, and auto-routing.

Typical Response
1-3 s
Classification Accuracy
99.1%
Tone Customization
4 Styles
POST /api/v1/ai/email-reply
{
    "email_text": "Hi, I was charged twice for my March invoice. Can you refund the duplicate payment?",
    "tone": "friendly"
}
200 OK response.json
{
    "data": {
        "result": {
            "reply_text": "Hi there, thanks for flagging this. I can see the duplicate charge on your March invoice and have started a refund for the second payment. You should see it back on your card within 5-7 business days.",
            "confidence_score": 0.91,
            "requires_human_escalation": false,
            "escalation_reason": null,
            "triggered_actions": []
        }
    }
}

Email & Communication APIs: 3 APIs

2 credits per call. Each one has its own page with parameters, code and examples.

  • Live

    Email Reply

    Generate intelligent, context-aware email replies based on the original email and optional analysis results. Customize the response with different tones, writing styles, languages, and business instructions to produce professional, human-like replies.

    POST /api/v1/ai/email-reply
    2 credits Docs Try it
  • Live

    Email Analyze

    Analyze incoming emails using AI to extract structured insights such as category, intent, priority, sentiment, language, entities, and summary.

    POST /api/v1/ai/email-analyze
    2 credits Docs Try it
  • Live

    Email Workflow

    Determine the most appropriate business action for an email using AI. The API analyzes the email and recommends workflow decisions such as replying, forwarding, assigning, archiving, escalating, or routing to the correct department.

    POST /api/v1/ai/email-workflow
    2 credits Docs Try it
Definition

What are the Email & Communication APIs?

RSFlowHub Email & Communication APIs streamline inbox operations by analyzing incoming messages for intent, urgency, and sentiment, while generating contextually grounded, professional drafts. Equipped with automatic HTML stripping and CRM entity extraction, these endpoints reduce customer support response times from hours to milliseconds.

APIs
3
Price
2 credits per call
Authentication
X-API-Key header
Format
JSON in, JSON out
Typical response
1 to 3 seconds
Fallback
Automatic, failed calls not charged

Quickstart

A real request to POST /api/v1/ai/email-reply. Every API in this category works the same way.

request.sh
curl -X POST "https://rsflowhub.com/api/v1/ai/email-reply" \
  -H "X-API-Key: rfh_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"email_text":"Hi, I was charged twice for my March invoice. Can you refund the duplicate payment?","tone":"friendly"}'
response.json
{
    "success": true,
    "request_id": "req_3f9a2c7e-5b1d-4e8a-9c2f-7d6e1a0b4c8d",
    "data": {
        "result": {
            "reply_text": "Hi there, thanks for flagging this. I can see the duplicate charge on your March invoice and have started a refund for the second payment. You should see it back on your card within 5-7 business days.",
            "confidence_score": 0.91,
            "requires_human_escalation": false,
            "escalation_reason": null,
            "triggered_actions": []
        }
    },
    "meta": {
        "version": "v1",
        "timestamp": "2026-10-05T09:30:00Z"
    }
}

Why teams use Email & Communication APIs

Urgency & Sentiment Priority Scoring

Classifies incoming emails into High, Medium, or Low priority instantly.

Contextual Smart Reply Generation

Drafts professional, context-aware email responses tailored to customer inquiry tone.

CRM & Helpdesk Auto-Routing

Extracts intent and action items to automatically route emails to correct support queues.

Use cases

Typical pipelines built with Email & Communication APIs.

Helpdesk Inbox Auto-Triage & Prioritization

Automatically tag incoming support emails by department (Billing, Tech, Sales) and assign urgency scores to meet customer SLAs.

  1. Inbound Email
  2. Email Triage API
  3. Zendesk/Freshdesk Priority Tag

Smart Draft Suggestions for Support Representatives

Generate draft replies to customer inquiries instantly, allowing human agents to review and send with a single click.

  1. Customer Inquiry
  2. Generate Reply API
  3. Agent Dashboard Draft Preview

Executive Email Summarization & Action Item Extraction

Condense multi-turn email threads into concise briefings with identified deadlines and owner assignments.

  1. Thread History
  2. Email Summary API
  3. Slack/CRM Notification

RSFlowHub vs provider SDKs vs self-hosting

How the Email & Communication APIs compare with calling a provider directly or running your own models.

TopicRSFlowHubProvider SDKSelf-hosted
Triage & Routing Automated ClassificationCustom Prompt EngineeringFine-Tuned BERT Pipeline
Tone Control Standardized Parametric TonesVariable Prompt PromptingMultiple Checkpoints
CRM Integration Ready JSON Webhook PayloadManual Text Parsing RequiredCustom Adapter Layers
Security & PII Zero Email Body PersistenceSubject to Cloud RetentionLocal Network Only
Pricing Model 1 Base Credit Per EmailDynamic Per-Token BillingDedicated GPU Server Bill

Frequently asked questions

Can I customize the reply tone for generated email responses?
Yes! You can pass custom tone parameters such as "professional", "friendly", "formal", or "empathetic" to align with your brand voice.
Does the Email API support HTML email bodies?
Yes. The API automatically sanitizes HTML formatting while extracting the core message semantics, avoiding prompt injection or token bloat.
How does the Email API determine priority and urgency?
The classification engine analyzes semantic signals, churn risk markers, SLA triggers, and financial/billing keywords to calculate a calibrated urgency score.
Is our company email data stored on RSFlowHub servers?
No. RSFlowHub does not use your text to train AI models. Request text is sent to the selected AI provider only to produce the result, usage metadata (character counts and credits) is logged for billing, and identical requests may be cached for up to 24 hours so repeats cost less.
Can this be integrated with tools like Zapier or Make?
Yes. RSFlowHub returns uniform JSON envelopes with clean status codes, making it simple to trigger via standard webhooks from any automation platform.

Other API categories

All categories

Build with Email & Communication APIs

Free plan with 100 credits/month + 1,000 bonus credits when you sign in before 23 Nov. One key works for every API in every category.

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