Inbox

Use Settings > Inbox to give custom agents their own email addresses.

This setup uses Agentmail.

Start With A Domain

Before you can provision an agent inbox, you need a domain first.

Start in Settings > Domains to buy a domain from Cofounder, import one, or transfer one in.

After that, go to Settings > Inbox and choose which domain should be used for agent inboxes.

Inbox Domain Setup Takes Time

Inbox domain setup is not instant.

After domain or nameserver changes, Agentmail still needs time to provision and verify the inbox domain. During that window, the inbox domain can show as pending or still checking setup.

Provision An Inbox For An Agent

Once an inbox domain is ready, you can provision an inbox for a custom agent.

In Settings > Inbox, pick the agent, choose the inbox-ready domain, set the inbox handle, and provision the inbox.

That gives the agent its own email address on your domain.

Warm Up a New Inbox Before Outreach

Some workspaces can start inbox warming while provisioning a new agent inbox. Inbox warming gives the inbox time to build safe sending history before the agent uses it for outreach.

When inbox warming is available, turn on Inbox warmup before you provision the inbox. Cofounder creates the inbox in a warmup-only state, starts the warmup enrollment, and keeps outreach locked until the domain reaches the required minimum.

Inbox warming is only available when all of these are true:

the domain was purchased through Cofounder
the domain has not been imported or transferred in
the domain is verified and ready for Agentmail inboxes
the inbox is new, and warmup is selected before provisioning it
the domain does not already have regular outreach inboxes

Imported domains, transferred domains, and domains that already have normal outreach inboxes are not eligible for new inbox warmup. If a domain is warming, new regular outreach inboxes on that domain stay blocked until warmup is released.

Warmup has a 21 day minimum. Cofounder recommends 28 days for the full benefit. Once warmup starts, it cannot be cancelled to unlock outreach early.

When the domain reaches the minimum, Settings > Inbox shows the warmup progress and lets an admin enable outreach for the domain. Releasing outreach updates the warmed inboxes so agents can send normal email from that domain.

What Happens After Provisioning

When an inbox is provisioned for an agent:

Cofounder creates the inbox for that agent
the agent can send and receive email through that inbox
incoming messages are available to that agent's email workflow

When inbox warming is selected:

Cofounder creates the inbox as warmup-only
the inbox participates in warmup automation instead of normal outreach
the whole domain stays blocked for outreach until every warming inbox on that domain reaches the 21 day minimum and outreach is enabled

Scheduled follow-up work for that agent is managed separately with scheduled tasks.

What Inbox Settings Control

Inbox settings let you manage:

which domains are available for agent inboxes
which agent gets which inbox address
the inbox handle and display name
whether that inbox is enabled
warmup progress and outreach release, when inbox warming is available

Disabled inboxes still exist, but they stop processing incoming email.