Alternate email addresses

You can configure up to 25 alternate email addresses in Plain, letting you manage multiple support inboxes (e.g. support@, billing@, security@) from a single workspace.

How to set up alternate addresses

Go to Settings → Email and scroll to the Alternate addresses section.

Each alternate address must:

• Use the same domain as your primary support address. For example, if your primary is help@acme.com, valid alternates include billing@acme.com — but not billing@acme.io.

• Be forwarded to Plain the same way as your primary address — by setting up a forwarding rule in your email provider or domain registrar pointing to your Plain inbound address. No additional DNS records are required; the DNS setup you completed for your primary address covers all addresses on the same domain.

How alternate addresses work

Once configured:

• Plain automatically replies from the address the customer originally contacted. A thread started by emailing billing@acme.com will use that address on all replies by default.

• You can manually select any of your configured addresses when composing a reply, if you need to send from a different one.

• The thread shows which address the customer contacted, so context is always clear to your team.

Why use alternate addresses

• Unify your workflows — manage all incoming support emails in one place without switching tools or accounts

• Keep communication consistent — customers always receive replies from the address they used, automatically

• Maintain branding across departments — use purpose-specific addresses like billing@ or security@ without complicating your setup