Nikita Stoletov
CTO | Outbound Infrastructure & Deliverability Engineering
CTO designing cold email infrastructure and outbound systems at scale. Built and managed infrastructure delivering over 50M emails monthly across 1,200+ domains with 98% inbox placement.
MailDeck · Enterprise Email Infrastructure
Cold Email for Agencies: How to Manage 500+ Inboxes Without Burning Domains
We manage infrastructure for agencies running 30-40 clients each. Here's how to structure domains, diversify providers, and rotate at scale without burning inbo...
Cold Email at Scale: What Happens After 100K Emails/Month
10-20% of domains burn monthly at enterprise scale. We share the metrics, thresholds, and rotation strategies from managing 650K+ Outlook inboxes across 1,500+ ...
Cold Email Deliverability Checklist: 15-Point Audit Template [Free]
Copy-paste deliverability checklist based on 50M+ emails/month across 3,000+ domains. 15 infrastructure, DNS, and campaign checks that maintain 98% inbox placem...
Cold Email Domain Rotation: When and How to Rotate Sending Domains
10-20% of cold email domains burn monthly at scale. Complete domain rotation strategy with specific thresholds, timelines, and recovery protocols based on data ...
How to Choose a Domain for Cold Email: The Complete 2026 Guide
MailDeck manages 3,000+ cold email domains across 1,631+ clients. This guide covers TLD selection, naming conventions, how many domains you need, aged vs fresh ...
How to Audit Your Cold Email Infrastructure in 30 Minutes
A DNS audit of 1,000+ cold email domains found 67% had at least one critical authentication error. This 30-minute cold email infrastructure audit checklist cove...
Cold Email Infrastructure Diversification: Why One Provider Isn't Enough
Data from 833K+ inboxes shows diversified infrastructure delivers 15-50% better inbox placement than single-provider setups. The 50/30/20 ratio explained.
Cold Email Warm Up: What Actually Works in 2026
Day-by-day warm-up schedule backed by data from 833K+ inboxes. Learn what warm-up metrics matter, common mistakes that kill deliverability, and how to fix warm-...
Instantly.ai Review 2026: Detailed Sequencer Breakdown From 50M+ Emails Monthly
Infrastructure-first Instantly.ai breakdown covering pros, cons, campaign setup, pricing, and competitor comparison. Based on managing 50M+ emails monthly acros...
Plusvibe Review: Detailed Cold Email Sequencer Breakdown [2026]
Hands-on Plusvibe review from an infrastructure team delivering 50M+ emails/month. Features, pricing, real pros and cons, optimal settings for Outlook/Google/SM...
Shared IP vs Dedicated IP for Cold Email: What Actually Affects Deliverability
We analyzed 270M+ cold emails across 833K+ inboxes to break down shared IP vs dedicated IP for cold email. Real deliverability data, provider IP model compariso...
SMTP Error Codes in Cold Email: What Each Code Means for Your Deliverability
We process 7.5M+ emails daily. Here's every SMTP error code you'll encounter in cold email, what each one means, and the exact action to take.
SPF, DKIM, DMARC for Cold Email: The Complete DNS Setup Guide with Error Analysis
We audited DNS records of 1,000+ cold email domains. 67% had SPF errors. Complete setup guide with the 10 most common mistakes and how to fix them.