Mailercloud

batch_create_contacts

Create multiple contacts at once in bulk. Do not include sensitive personal data (health, financial, government ID, payment card, passwords).

Input Schema

TableJSON Schema

Name	Required	Description
`api_key`	No	MailerCloud API key
`list_id`	Yes	List ID for all contacts,required
`contacts`	Yes	Array of contact objects,required

Schema Changelog

Changes observed during successful MCP inspections.

Changed20 schema fields changedOct 8, 2026
- addedInput schema / properties / contacts / items / properties / city / description
```
Added value: +"City"
```
- addedInput schema / properties / contacts / items / properties / company_name / description
```
Added value: +"Company name"
```
- removedInput schema / properties / contacts / items / properties / contact_type
```
Removed value: -{
-  "type": "string"
-}
```
- addedInput schema / properties / contacts / items / properties / country / description
```
Added value: +"Country"
```
- addedInput schema / properties / contacts / items / properties / custom_fields / description
```
Added value: +"Custom field values. Only keys returned by list_custom_fields. Values: text, number, or date (YYYY-MM-DD). Do not include sensitive personal data (health, financial, government ID, payment card, passwords)."
```
- addedInput schema / properties / contacts / items / properties / department / description
```
Added value: +"Department"
```
- addedInput schema / properties / contacts / items / properties / email / description
```
Added value: +"Contact email address,required"
```
- addedInput schema / properties / contacts / items / properties / first_name / description
```
Added value: +"First name"
```
- removedInput schema / properties / contacts / items / properties / id
```
Removed value: -{
-  "type": "string"
-}
```
- removedInput schema / properties / contacts / items / properties / industry
```
Removed value: -{
-  "type": "string"
-}
```
- addedInput schema / properties / contacts / items / properties / job_title / description
```
Added value: +"Job title"
```
- addedInput schema / properties / contacts / items / properties / last_name / description
```
Added value: +"Last name"
```
- removedInput schema / properties / contacts / items / properties / lead_source
```
Removed value: -{
-  "type": "string"
-}
```
- removedInput schema / properties / contacts / items / properties / list_id
```
Removed value: -{
-  "type": "string"
-}
```
- removedInput schema / properties / contacts / items / properties / middle_name
```
Removed value: -{
-  "type": "string"
-}
```
- addedInput schema / properties / contacts / items / properties / phone / description
```
Added value: +"Phone number"
```
- removedInput schema / properties / contacts / items / properties / postal_code
```
Removed value: -{
-  "type": "string"
-}
```
- removedInput schema / properties / contacts / items / properties / salary
```
Removed value: -{
-  "type": "string"
-}
```
- addedInput schema / properties / contacts / items / properties / state / description
```
Added value: +"State"
```
- addedInput schema / properties / contacts / items / properties / tags / description
```
Added value: +"Tags to assign"
```
First observedSep 2, 2026

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