1. Dedicated IP Overview

What is a Dedicated IP?

A Dedicated IP is an IP address reserved exclusively for your account. It allows you to build and maintain an independent sender reputation with ISPs, improving deliverability and inbox placement.

Do I need DNS configuration to use a Dedicated IP?

Yes. Netcore strongly recommends configuring a custom envelope (return-path) for your domain from the Email API dashboard. This is essential for proper reputation tracking and deliverability.

2. Sending Emails Using Dedicated IPs

How do I send an email using a Dedicated IP?

Pass the pool name containing your Dedicated IP as the value of the ippool parameter in your API request or as the ippool header in SMTP.

How can I send emails through the default IP of my account?

To force delivery through the account’s default IP, pass:

ippool = default

This bypasses domain-level and pool-based selection.

3. IP Selection & Delivery Hierarchy

How does Netcore choose the IP for email delivery?

Netcore selects the delivery IP using the following hierarchy (highest to lowest priority):

ippool value passed in the API or SMTP call
IP assigned to the sending domain
Default IP of the account
Netcore shared IP pool (fallback)

What happens when I click “Set As Default” for an IP?

The selected IP becomes the account-level default IP.
All emails use this IP unless a different IP is specified via ippool or assigned at the domain level.

What happens if there is no default IP?

If no default IP exists and no IP is assigned to the domain, emails are delivered through Netcore’s shared IP infrastructure, unless overridden.

4. Using Netcore Shared IPs

How do I send emails through Netcore’s shared IPs?

If no default or domain IP exists, simply do not pass the ippool parameter.
If a default or domain IP exists, explicitly pass:
```
ippool = shared
```

5. IP Warm-Up

Why is IP warm-up required?

A new Dedicated IP has no sending history. Sudden high-volume traffic from a new IP is often flagged as suspicious by ISPs, impacting delivery and inbox placement.

Gradual warm-up helps establish a positive reputation.

How do I warm up a Dedicated IP?

After purchasing a Dedicated IP, Netcore provides a customized warm-up plan. A typical schedule looks like this:

Day	Emails
1	500
2	1,000
3	2,000
4	4,000
5	6,000
6	8,000
7	10,000
8	15,000
9	20,000
10	50,000
11	70,000
12	100,000

Increase volume only if engagement and bounce rates remain healthy.

6. IP Pools: Concepts & Rules

What is a pool name?

A pool is a logical grouping of one or more IPs. Passing a pool name using ippool tells Netcore to select an IP from that pool for delivery.

Pools are commonly used to:

Separate transactional and promotional traffic
Manage warm-up IPs
Scale traffic across multiple IPs

What is `pool0` and why can’t I modify it?

pool0 is a system-managed default pool. It cannot be edited or deleted because it ensures platform stability and fallback behavior.

7. Creating and Managing IP Pools

How do I create a new pool and assign an IP?

From the Email API dashboard:

Create a new pool
Assign one or more available IPs
Use the pool name in API or SMTP calls

Which IP is used when a pool has multiple IPs?

If a pool contains multiple IPs, Netcore selects one using internal load distribution and availability logic optimized for delivery.

How can I remove an IP from a pool?

You can remove an IP if:

The pool is not system-managed
The IP is not required by a domain or subaccount

How do I delete a pool?

A pool can be deleted only if:

It contains no IPs
It is not actively referenced

8. Domain-Level IP Assignment

Why should I assign an IP to a domain?

Assigning an IP to a domain ensures:

Consistent sender identity
Stable reputation per domain
Predictable IP usage without passing ippool

How do I assign or unassign an IP to a domain?

From the dashboard, you can:

Assign one or more IPs to a domain
View assigned IPs
Unassign IPs when no longer needed

Domain-level IPs override account defaults unless ippool is passed.

9. Subaccount IP Management

How do I assign an IP to a subaccount?

From the parent account:

Select the subaccount
Assign one or more IPs
Optionally set a default IP

How can I check or remove IPs from a subaccount?

You can view and unassign IPs from the subaccount configuration panel, provided the IP is not set as default or required by an assigned domain.

How do I set a default IP for a subaccount?

Select one of the assigned IPs and mark it as the default IP.
This IP is used unless overridden by domain-level assignment or ippool.

10. Domain and Subaccount Interaction

If a domain with an assigned IP is mapped to a subaccount, does the IP assignment continue?

Yes. Domain-level IP assignments persist even after the domain is assigned to a subaccount, ensuring consistent sender reputation.

11. Key Takeaways

ippool has the highest priority in IP selection
Domain-level IPs ensure consistency and reputation control
Pools simplify IP management and scaling
Shared IPs act as a fallback or explicit choice