Domains in Kerio Connect

An email domain is a unique identifier which is used to recognize to which server messages should be delivered. In email address, the domain identifier follows the @ symbol.

Email domain can differ from the name of the server where Kerio Connect is installed, for example:

  • Domain name —
  • Email domain name —
  • User email address —

Kerio Connect may include any number of email domains.


User accounts are defined separately in each domain. Therefore, domains must be defined before you create user accounts.

Domains are managed in section Configuration > Domain.

To display various information in the columns, right-click any column name and select the items you want to display.

Internet hostname

To make messages deliverable, you must specify a DNSDomain Name System - Enables the translation of hostnames to IP addresses and provides other domain related information. name of the server with Kerio Connect installed — the Internet hostname.

Kerio Connect also uses the Internet hostname when establishing the SMTPSimple Mail Transport Protocol - An internet standard used for email transmission across IP networks. traffic. When the SMTP connection is established, the EHLO command is used for retrieving the reverse DNS record. The server that communicates with Kerio Connect can perform checks of the reverse DNS record.


If Kerio Connect is running behind NAT, use the Internet hostname of the firewall.

To change the internet hostname:

  1. In the administration interface, go to Configuration > Domains.
  2. Click the Internet hostname button.

  1. Type the server name and click OK.

Primary domain

One domain in Kerio Connect must be set as primary. Users defined in a primary domain use only their username for authentication, not the whole email address.

By default, the first domain you create is set as primary automatically.

To change the primary domain:

  1. In the administration interface, go to Configuration > Domains.
  2. Select a domain and click the Set as Primary.

Adding new domains

For more information refer to Creating domains in Kerio Connect.