Scale · Outbound at Volume
Design an Outbound Domain & Email Infrastructure Plan
Plan the exact domains, mailboxes, DNS records, and warmup schedule that will protect your primary brand while sending serious cold volume.
When to use
Use this before you buy a single domain or set up a single mailbox. Also use it when migrating off Mailgun/SendGrid back to Google Workspace for cold, or when a deliverability audit flagged your stack. Run it as the first deliverable of any new sales hire.
The prompt
You are a head of outbound at a digital marketing agency running 1,000+ touches/week without burning domains. You set up infrastructure that survives Google's spam filters in 2026. Agency: [AGENCY_NAME] — [SERVICES] | ICP: [ICP] | Weekly target: [WEEKLY_VOLUME_TARGET] | Team: [TEAM_SIZE] | Stack: [TECH_STACK] | Sending domains: [DOMAINS] | Primary brand domain: [PRIMARY_DOMAIN] | Mailbox provider: [MAILBOX_PROVIDER] Design the domain + email infrastructure plan to support [WEEKLY_VOLUME_TARGET]. Specify number and naming of alt domains, mailbox-per-domain count, DNS records (SPF, DKIM, DMARC, MX, BIMI optional), warmup schedule, and the protection plan for [PRIMARY_DOMAIN]. - [PRIMARY_DOMAIN] never sends cold — only inbound + replies + closed-customer comms. - Alt domains visually + linguistically similar but not deceptive. - DMARC starts at p=none for 30 days, then p=quarantine. - Per-mailbox cap 30-50/day cold, after 21-day warmup. - Include monthly DNS health audit step. Output: (1) Domain purchase list with naming logic, (2) Mailbox plan per domain, (3) DNS record table (SPF/DKIM/DMARC/MX text values), (4) Warmup schedule week 1-4, (5) Primary-domain protection rules, (6) Monthly audit checklist.
Variables
[AGENCY_NAME]Your agency name[SERVICES]What you sell[ICP]Ideal customer profile[WEEKLY_VOLUME_TARGET]Cold emails per week[TEAM_SIZE]Number of reps sending[TECH_STACK]Sending tool + warmup tool[DOMAINS]Existing alt domains[PRIMARY_DOMAIN]Your main brand domain[MAILBOX_PROVIDER]Google Workspace, Microsoft 365, Zoho
Example input
AGENCY_NAME: Trellis Studio | SERVICES: Web design + Webflow dev | ICP: SaaS marketing leaders | WEEKLY_VOLUME_TARGET: 2000 | TEAM_SIZE: 4 SDRs | TECH_STACK: Instantly + Instantly warmup | DOMAINS: none yet | PRIMARY_DOMAIN: trellis.studio | MAILBOX_PROVIDER: Google Workspace
Example output
Domain plan: buy 4 alt domains — gettrellis.com, trellis-team.com, hellotrellis.co, trellisstudio.co. Naming logic = same brand name, varied prefix/suffix/TLD, all 301 to trellis.studio for any web traffic. Mailboxes: 4 domains x 4 mailboxes each = 16 mailboxes = capacity 16 x 40/day x 5 = 3,200/wk (60% headroom over 2,000 target). Mailbox names match real humans: firstname@, firstname.lastname@, etc. — no info@ or sales@. DNS per domain: SPF = v=spf1 include:_spf.google.com ~all; DKIM = Google-generated 2048-bit key; DMARC = v=DMARC1; p=none; rua=mailto:dmarc@trellis.studio (30 days), then p=quarantine; MX = Google MX records standard. Warmup: Wk 1 5/day, Wk 2 10/day, Wk 3 20/day, Wk 4 30-40/day cold-eligible. Primary protection: trellis.studio sends only inbound replies + customer email; DMARC at p=reject; never imported into Instantly. Monthly audit: check MXToolbox blacklist, GlockApps inbox placement test, DMARC report review, mailbox-level reply rate.
Pro tips
- Buy 4 domains minimum even at low volume — you want spares ready before you need them.
- DMARC at p=none first, always — flipping straight to quarantine bins your own internal email.
- Run a monthly GlockApps test — it is $50 and prevents 6-figure mistakes.
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A prompt is not a system.
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