WaymakerOS Help Center

Email aliases allow a single mailbox to receive email at multiple addresses across different domains. This is essential for domain migrations, company rebranding, or supporting multiple email identities.

What Are Email Aliases?

An email alias is an additional email address that delivers to an existing mailbox. Unlike email forwarding, the email is stored in the mailbox - not redirected elsewhere.

Example:

Primary mailbox: john@newcompany.com
Alias: john@oldcompany.com
Result: Emails to both addresses arrive in John's single mailbox

When to Use Email Aliases

Domain Migration / Rebrand

When your company changes domains (merger, rebrand, or consolidation):

Set up mailboxes on the new domain (@newcompany.com)
Add aliases from the old domain (@oldcompany.com)
Users receive email at both addresses in one inbox
Gradually transition external contacts to the new domain
Eventually retire the old domain aliases

Multiple Business Identities

When employees need to appear under multiple brands:

consultant@agencybrand.com (client-facing)
consultant@parentcompany.com (internal)

Simplified Addresses

Add short or memorable aliases:

Primary: john.smith@company.com
Alias: johns@company.com

Creating Email Aliases

Using the UI (Individual Aliases)

Navigate to WaymakerOne > Email > User Mailboxes
Click the menu (three dots) icon next to a user's mailbox
In the Email Aliases section, enter the alias local part
Select the domain from the dropdown (any verified domain)
Click the + button to add the alias

Bulk aliases during a migration

For a domain migration you usually want every mailbox on the new domain to keep receiving mail at its old address. Aliases are added per mailbox from the steps above; work through the User Mailboxes list one mailbox at a time, adding the old-domain alias to each.

Migration workflow

Scenario: Migrating from oldcompany.com to newcompany.com

Verify both domains — the old and new domain must both be verified in WaymakerOne > Email > Domains
Create mailboxes on the new domain for everyone who needs one
Add the old-domain alias to each new mailbox
Check each mailbox — the alias appears in its Email Aliases section
Tell external contacts the new address, and keep the aliases until they have switched

Removing aliases (domain retirement)

When you are ready to decommission the old domain, remove its aliases from each mailbox's Email Aliases section, then remove the domain.

Warning: After removal, emails to the old addresses will bounce.

Email Aliases vs Email Forwarding

Feature	Email Aliases	Email Forwarding
Delivery	Same mailbox	Forward to external address
Storage	In the mailbox	No storage
Reply Address	Can reply as alias	N/A (no mailbox)
Use Case	Domain rebrand	Admin addresses
Management	WaymakerOne > User Mailboxes	WaymakerOne > Domains

Choose Email Aliases when:

Users need to receive email from old domains
You're migrating/rebranding domains
Users need multiple identities in one inbox

Choose Email Forwarding when:

You need administrative addresses (postmaster, abuse)
No mailbox should exist on the domain
Emails should go to external addresses

Best Practices

Keep a list of the aliases you add - so retiring the old domain later is a checklist, not a hunt
Keep old aliases active - Don't remove until you're sure all contacts have updated
Communicate the change - Notify external contacts of new email addresses
Update email signatures - Ensure users update their signatures to the new domain
Test before going live - Verify email delivery works as expected

Troubleshooting

Alias Not Receiving Email

Verify the alias was created: open the mailbox's menu and check its Email Aliases section
Check the source domain is still verified
Ensure DNS records for the old domain are still active

"Address Already Exists" Error

The alias address conflicts with:

An existing mailbox
Another alias
A forwarding alias

Check both domains for conflicts.

Email Aliases for Domain Rebrand