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.

foundermanagerAdvanced⏱ 6-10 hours of infra research
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.
Works with
ClaudeChatGPTGemini
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