Business Email for Agencies with Multiple Clients: Guide

Quick answer: To manage business email for agencies with multiple clients, the ideal approach is to use a platform featuring multiple domains per organization and centralized access control. This lets you administer mailboxes across different brands within the same dashboard, assign individual permissions to team members, and eliminate the prohibitive cost of per-user billing.

Managing communication for several brands demands strict organization. Marketing, advertising, design, and PR agencies frequently need to create and operate support or sales mailboxes for the clients they serve. However, traditional email pricing models make this routine expensive and chaotic.

Why does per-user billing make business email for agencies with multiple clients unsustainable?

Most global business email providers charge fixed monthly fees for every address created. When an agency needs to operate mailboxes such as support@clientone.com, contact@clienttwo.com, and events@clientthree.com, the bill multiplies fast.

If you have five team members managing three distinct brands, creating dedicated accounts for each employee on every domain generates dozens of paid licenses. To bypass these high costs, many teams turn to risky practices, such as sharing the same account password among several people.

Beyond exposing strategic data, password sharing compromises governance. To understand the operational risks involved, check out our article on how to give access to company email without sharing passwords.

What are the risks of sharing passwords and mailboxes among team members?

When multiple people use the same credentials to access a client's mailbox, severe security and customer service flaws arise:

1. Lack of traceability: It becomes impossible to know who read, archived, or replied to an important message.
2. Security lockouts: Simultaneous logins from different IPs trigger suspicious activity alerts from providers, locking the team out of the account.
3. Vulnerabilities during offboarding: If an employee leaves the agency, you must update the passwords for every account they managed. Learn more details in our guide on what to do with the email of an employee who left the company.

To solve this challenge of managing simultaneous brands, an efficient strategy is centralization. We explain this mechanism in how to manage multiple domains in a single inbox.

How to organize business email for multiple clients in practice?

A secure and productive way to work involves separating the concept of a user (who logs in) from the concept of a mailbox (the public email address). In Domailo, for instance, you add client domains to your organization and link your team members to whichever mailboxes they need.

Each professional accesses webmail with their own login and password. Once logged in, they can view messages from the mailboxes they have been granted permission to access. The primary administrator centralizes control and can add or remove team members with a single click.

Below, we compare the traditional business email model with the organization-based approach used by Domailo:

Criteria	Traditional providers (Workspace, M365)	Domailo (Built for agencies and teams)
Billing model	Per user/individual license	Fixed price per organization
Multiple domain management	Requires separate accounts or extra licenses	Multiple domains in the same dashboard (by plan)
Shared mailboxes	Requires complex permissions or password sharing	Direct assignment of people to mailboxes with their own logins
Admin dashboard	Dense, layered enterprise menus	Clean, straightforward browser interface
External apps (IMAP/POP)	Full support for Outlook/Thunderbird	Streamlined webmail access (no IMAP/POP)

If your agency requires tools like collaborative cloud spreadsheets, native IMAP integration with desktop Outlook, or full office suites, platforms like Google Workspace remain the recommended choice. However, if the agency's goal is simply to send and receive professional emails across multiple domains under lean administration, Domailo's model solves the problem without wasting budget.

How to configure the correct authentication for client domains?

To ensure messages sent by the agency on behalf of the client land in the inbox and not the spam folder, proper DNS authentication is mandatory. Major global providers require three essential configurations:

• SPF (Sender Policy Framework): Specified in RFC 7208, defines the servers authorized to send emails for that domain.
• DKIM (DomainKeys Identified Mail): Documented in RFC 6376, adds a cryptographic signature to message headers.
• DMARC: Standardized by RFC 7489, dictates what receiving servers must do if SPF or DKIM checks fail.

In addition to technical standards, Google's Email Sender Guidelines mandate that any domain sending messages keep SPF and DKIM records configured to prevent delivery blocks on Gmail accounts.

In Domailo, when connecting a client's domain, the platform displays the exact DNS records (MX, SPF, and DKIM) that need to be pointed in your hosting provider or domain registrar. If the client has a .com.br domain registered directly at Registro.br, remember that their free DNS does not support the underscore character (_), which prevents creating verification and DKIM records. In these cases, simply migrate the domain's DNS zone to Cloudflare's free plan and configure the entries there.

Which plans serve agencies and small businesses?

Domailo offers plans structured around your operation's scale, without surprise per-user fees:

• Startup plan: US$ 5/month (or US$ 50/year when paid annually upfront). Includes 1 domain, 2 mailboxes, and 2 users.
• Essential plan: US$ 9/month (or US$ 90/year when paid annually upfront). Supports up to 3 domains, 5 mailboxes, and 5 users.
• Team plan: US$ 19/month (or US$ 190/year when paid annually upfront). Perfect for expanding agencies, supporting 10 domains, 20 mailboxes, and 20 users.

All paid plans include the same core operational features: multiple domains up to your plan limit, light and dark mode webmail, fast search, and shared mailboxes with individual permissions.

Conclusion: simplify your agency's email with Domailo

Managing brands and clients does not have to involve insecure password spreadsheets or bills that increase with every hire. Centralizing your domains with team access controls delivers legal security, responsive client service, and predictable costs for your business.

Domailo was built to simplify corporate email for small businesses and agencies prioritizing efficiency. Try Domailo free for 30 days and discover how simple it is to manage client mailboxes in one place.