> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.ecall-messaging.com/sitemap.xml
> Use this file to discover available pages before exploring further.
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# Format 1: Recipient in the subject box

# Format 1: Recipient in the subject box

You can send a message to a single recipient by writing the recipient's number in the e-mail's subject box.

**Procedure:**
1. Write down the recipient's number in the subject box.
2. Send the e-mail to message@ecall.ch.

![](https://storage.crisp.chat/users/helpdesk/website/eaa1358e28d0c000/image_1cdw6kg.png)

**Important**
* As an sender's adress the e-mail must include an adress that you have registered in the list of allowed sender adresses in the personal settings.
* In the menu option 'Settings: Access via e-mail' the check box 'I allow messages to be sent via my eCall account by e-mail' must be activated.
* You have to write the telephone number in the international format. Example for Switzerland: 0041 or +41