> For the complete documentation index, see [llms.txt](https://kasplo.gitbook.io/kasplo-doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kasplo.gitbook.io/kasplo-doc/channels/transactional-api-smtp/advanced-features.md).

# Advanced Features

Kasplo’s infrastructure is designed with performance, flexibility, and enterprise-grade deliverability in mind. Below are the advanced capabilities available to help power your email campaigns at scale.

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#### **Performance & Throttling**

Kasplo supports high-throughput sending, optimized per plan. We offer:

* Customizable rate limits based on your plan tier
* Burst control and auto-throttling to protect reputation during spikes
* Concurrency tuning for enterprise-grade deliverability

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#### **Suppression Management**

Stay compliant and protect sender reputation with automatic suppression:

* Bounces (hard and repeated soft bounces)
* Spam complaints
* Unsubscribes
* Manual suppression: Upload suppression lists via the dashboard or API

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#### **IP Pools**

Kasplo supports both shared and dedicated IP infrastructure:

* **Shared IPs**: Ideal for startups and smaller senders
* **Dedicated IPs (add-on)**: Recommended for high-volume senders who require full control and reputation isolation

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#### **AMP for Email**

Send interactive, dynamic AMP emails using Kasplo:

* Kasplo supports AMP MIME parts in addition to HTML and text
* AMP forms and endpoints must be client-hosted and HTTPS-enabled
* Great for use cases like live product galleries, dynamic forms, and in-email actions

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#### **Forwarding & Incoming Email Handling**

Kasplo supports storing and parsing email replies:

* View replies directly from your dashboard
* Route responses to specific teams or inboxes via forwarding rules

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#### **Attachments**

Easily include attachments with your emails:

* Supported file types: PDF, DOCX, PNG, JPG, CSV, ZIP
* Size limits vary by plan (up to 25MB supported in higher tiers)

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#### **CC & BCC Tracking**

Kasplo provides full support for CC and BCC recipients:

* Each CC and BCC email is treated as a unique email send, and is counted against your email credits
* Events like open, click, bounce, complaint, and unsubscribe are individually tracked
* All recipients (To, CC, BCC) share the same `X-Kasplo-Click-Tracking-ID`, allowing you to trace a single message across all recipient paths

  > Note: You will receive separate webhook events per recipient (To/CC/BCC), each with distinct delivery and engagement tracking.

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#### **Scheduled Send**

Pre-plan your email delivery with Kasplo’s Scheduled Send:

* **API**: Include the `send_at` field in your JSON payload
* **SMTP**: Add the `X-Sent-At` header to your email
* Supports scheduling **5 minutes to 6 months** in advance
* Once scheduled, emails cannot be edited or canceled
* Automatically queued and delivered at the exact specified time
* All times must be provided in **UNIX UTC timestamp** format