Managing Clients Across Multiple Servers

Overview

Each reseller Control Panel session manages the reseller account on the selected server. In Management → Subscriptions, choose Open control panel on the service that owns the customers you intend to manage. One service's user list does not combine every reseller service you own.

Track the Customer's Service and Server

Keep a record of each customer's username, domains, reseller subscription, server, and any custom hostnames. Confirm these before creating an account or changing DNS. Use Managing Customers for the account procedures and Disk Usage for an individual account's breakdown.

Use Distinct Client Hostnames

A mail-client hostname points to one server. When customers are spread across servers, give them the hostname for their assigned server rather than reusing a name that points elsewhere.

You can use the server hostname shown under Email Clients, or configure a custom hostname through Advanced → SSL Certificates. That form offers mail and webmail prefixes for the selected domain. It does not accept an arbitrary hostname such as mx01.example.com as a certificate request.

Example assignment	Custom client hostname	DNS target
Service A with example.com	mail.example.com	The target shown in Service A's certificate page
Service B with example.net	mail.example.net	The target shown in Service B's certificate page

These are examples using domains you control. Follow Custom Hostnames to publish the appropriate CNAME, request the certificate on the correct service, and verify activation before giving the name to users.

Keep DNS and Branding Tasks Separate

• Mail-client hostnames and Roundcube: configure them for the account's server using Custom Hostnames.
• In-house webmail: use Custom Webmail Branding and its own DNS target.
• Customer panel URL and server labels: configure them under Reseller → Branding. A friendly server label does not move an account.
• MX and SPF guidance: use the defaults shown by the panel, or the reseller custom DNS guidance controls if you intend to maintain them. Customers must still publish their own DNS records. MX destinations must not be CNAMEs.

Client Communication

Provide each customer with the server hostname or verified custom mail hostname, encrypted ports, and their mailbox's full email address. Provide passwords through a secure channel. See Email clients and webmail for the connection settings.

Keep the service/server assignment with the customer's records so future support and provisioning changes target the correct account.

Capacity Planning

Review Capacity Planning for Resellers and Choosing the Right Reseller Package before adding capacity or planning a move.