# Create a send connector in Exchange on premise

The custom relay uses a send connector to forward outgoing messages to the Zivver SMTP Server, so you must create a send connector in Microsoft Exchange On-Premise.

Microsoft Exchange routes each outbound message through only one send connector. Review the existing send connectors in Exchange On-Premise before you begin. If another specific send connector must also handle Zivver messages, a custom relay might not be feasible. [Create a support ticket](https://support.zivver.com/s/contactsupport?language=en_US) and describe such use-cases.

## Prerequisites

Before you create the send connector, make sure you have created an [accepted domain](https://docs.zivver.com/en/admin/smtp/create-an-accepted-domain-on-premise.html) and a [contact](https://docs.zivver.com/en/admin/smtp/create-a-contact-on-premise.html).

## Procedure

01. Open the Exchange Administration Center (EAC).
02. Sign in as an administrator.
03. In the left-hand menu, select **Mail flow**.
04. Select **Send connectors**.
05. Click _add_ to add a new connector.
06. Name the connector `Zivver Send Connector`.
07. For **Type**, choose **Custom**.
08. Click Next.
09. Select **Route mail through these smart hosts**.
10. Click _add_.
11. Enter `smtp.zivver.com`.
12. Click Save.

_The smart host now appears in the list._
13. Click Next.
14. For **Smart host authentication**, choose **Basic authentication**.
15. Enable **Offer basic authentication only after starting TLS**.
16. In Zivver Organization Settings, generate [Mail Submission SMTP credentials](https://app.zivver.com/admin/smtp-credentials).
17. Enter the generated SMTP username in **User name**.
18. Enter the generated SMTP password in **Password**.
19. Click Next.
20. Click _add_.
21. For **Type**, enter `SMTP`.
22. For **FQDN**, enter the placeholder domain _zivver.org_.
23. For **Cost**, enter `1`.
24. Click Save.
25. Enable **Scoped send connector**.
26. Click Next.
27. Click _add_.
28. Select a server and click add ->.
29. Click OK.
30. Click Finish.

The send connector now processes all messages addressed to the placeholder domain.

Updated on 2026-06-18