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Start with a domain you own, a clear sender identity and a small number of properly configured mailboxes. Additional domains or mailboxes are not a substitute for relevant messages and a healthy recipient list.
1

Authenticate the sending domain

Configure SPF and DKIM with your mailbox provider, then set up DMARC with alignment and monitoring appropriate to your domain. Verify actual message headers. Follow your provider’s setup instructions rather than copying another domain’s DNS records.
2

Keep the mailbox count manageable

Use at most five outreach mailboxes per sending domain as an Emailx recommendation. Assign a real sender identity to each one. Check that every mailbox can receive replies and that its connection is healthy in the app.
3

Ramp up for at least two weeks

Begin with low volumes and increase gradually only while account and delivery signals remain healthy. Two weeks is a minimum preparation period, not automatic permission to send at the final ceiling on day fifteen. New or damaged reputation can require longer.
4

Use a conservative daily budget

After ramp-up, plan at most 30 outreach emails per mailbox per day, including follow-ups. Leave room for normal email and any warmup activity within the provider’s total allowance. Keep the lower of the app setting, provider allowance and your account’s healthy operating volume.
5

Monitor and adjust

Review bounces, complaints, provider warnings and replies. Pause increases when delivery deteriorates; fix the list, authentication or account issue first. Honor opt-outs and retain suppression in downstream systems.

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What warmup means here

A gradual introduction of legitimate sending activity, supported by correct authentication and monitoring. Buying a warmup service, waiting fourteen days or adding mailboxes cannot guarantee inbox placement. Do not manufacture engagement as a substitute for a healthy sending practice.

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API versus app setup

The v1 API exposes stored sender metadata and a gated, reviewed email launch workflow. It cannot buy domains, create mailboxes, configure DNS or run warmup; complete those steps with your provider and the Emailx app. An API sender-status response is not a live deliverability check. Email activation schedules approved messages within configured windows; it does not verify delivery. See prepare, review, and launch email. Google’s sender guidelines cover authentication, reputation and unsubscribe requirements. The five-mailbox, two-week and thirty-email values are Emailx recommendations, not Google quotas.