MULTI-TENANT COLD OUTBOUND DELIVERABILITY ARCHITECTURE
Isolation Topology: Primary Corporate Domain vs. Distributed Secondary Mailbox Grid
PRIMARY DOMAIN
company.com
Dedicated to 1:1 Business Comm,
Inbound Sales, Investor, Billing
MANDATORY PROTOCOLS:
✓ SPF (v=spf1 include:...)
✓ DKIM (2048-bit CNAME)
✓ DMARC (p=reject / strict)
Strict Isolation Rule
Zero automated cold volume.
Spam Rate Target: < 0.05%
SAFE FROM ESP PENALTIES
SECONDARY SENDING GRID
try-company.co / getcompany.io
12 Secondary Domains ($144/yr)
34 Distributed Mailboxes (3/domain)
Domain A (3 Inboxes @ 30/day)
Daily Volume: 90 emails | SPF/DKIM/DMARC
Domain B (3 Inboxes @ 30/day)
Daily Volume: 90 emails | SPF/DKIM/DMARC
Domains C-L (28 Inboxes @ 30/day)
Daily Volume: 840 emails | SPF/DKIM/DMARC
TOTAL CAPACITY: 1,020 EMAILS / DAY
(~30,000 Verified Sends / Month)
RECIPIENT GATEWAYS
Google & Microsoft
Enforcing Protocol Rules:
STRICT ESP LIMITS:
>0.30% Spam Rate =
Direct Junk / Block
Missing PTR = 550 Error
Operator Defense
If 1 domain crosses
0.30%, only 8% of
capacity degraded.
CONTAINMENT