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Service 03 / Outreach Consulting/ Email Deliverability

InboxDeliverability.

Google and Microsoft now send unauthenticated cold emails straight to the spam folder. Sending cold campaigns from your primary company domain risks blacklisting your entire corporate email.

We build isolated technical deliverability infrastructure. Dedicated secondary domains, SPF, DKIM, DMARC alignment, and automated warmup pools so your outreach consistently lands in front of real buyers.

Request Free DNS & Spam Audit
PRIMARY INBOX.
01. Deliverability Gap

Amateur Outbound vs. Engineered Deliverability

Why 70% of standard cold emails never get seen by executives, and how our infrastructure fixes it:

#
Technical Vector
Standard Outbound Setup
Manumerc Isolated Infrastructure
01
Sending Domains
Primary corporate domain; risks company-wide email failure

Isolated Secondaries: Dedicated alternative domains (e.g. getcompany.com) that protect primary corporate mail.

02
DNS Authentication
Missing DMARC or broken SPF 10-lookup limits

100% Strict Alignment: Custom DKIM 2048-bit keys, aligned SPF, and DMARC quarantine protocols.

03
Sending Volume per Mailbox
150–300 emails/day per user (triggers immediate spam filters)

Human Throttling: Strictly 30–40 emails/day per inbox. Volume is scaled by adding mailboxes, not blasting.

04
Bounce Rate Monitoring
5% to 15% bounce rate (Google penalty threshold is 0.3%)

Zero-Bounce Protocol: Pre-send SMTP server handshakes keep bounce rates strictly below 1.5%.

02. Infrastructure Pipeline

Our 4-Stage Deliverability Deployment

How we take your team from spam-folder limbo to consistent primary inbox delivery:

01 / STAGE

Domain Procurement

We buy 3 to 10 brand-adjacent secondary domains, age them, and configure Google Workspace or Microsoft 365 tenants.

ISOLATED TENANTS
02 / STAGE

DNS & MX Alignment

We configure custom tracking domains, 2048-bit DKIM records, SPF includes, and DMARC enforcement records.

100% PASS RATE
03 / STAGE

Automated Warmup Pools

Mailboxes spend 14 to 21 days in controlled peer-to-peer warmup networks, building high sender reputation scores.

HIGH SENDER SCORE
04 / STAGE

Postmaster Monitoring

Live Google Postmaster Tools monitoring tracks domain health, spam complaint ratios, and delivery telemetry continuously.

ACTIVE TELEMETRY
03. Due Diligence

Frequently Asked Questions

Why are our cold emails suddenly going to the spam folder?+
Google and Yahoo enacted strict sender requirements: unauthenticated domains without DMARC, high spam complaint rates (above 0.3%), or sending high volumes from single accounts trigger automated spam filters. Without isolated secondary domains and strict DNS alignment, primary domain reputation drops rapidly.
What is domain isolation in cold outreach?+
Domain isolation means never sending cold sales emails from your primary company domain. We purchase variations of your brand domain, configure separate Google Workspace or Microsoft 365 tenants, and set up independent SPF, DKIM, and DMARC records so your main corporate domain is 100% protected.
How long does it take to warm up a new sending mailbox?+
Proper warming requires 14 to 21 days. We gradually ramp sending volume using automated peer-to-peer warmup pools, ensuring high reply and read rates that build positive IP and domain reputation with Google and Microsoft algorithms before live campaigns launch.
How many emails can one mailbox safely send per day?+
To maintain long-term primary inbox deliverability, we cap daily cold volume at 30 to 45 emails per mailbox. To scale volume, we scale the number of mailboxes across multiple domains, rather than blasting high volumes from a single address.
Audit Your Inboxes

Free Cold Email Deliverability Audit

Send us a test email. We will inspect your DMARC, SPF, DKIM, MX setup, and blacklists to diagnose why your emails hit spam.

Request Free DNS Audit

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01. B2B SEO02. Prospect Intelligence03. Outreach Consulting> Cold Email Deliverability> Sales Outsourcing Agency

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