--- title: "Nikita Stoletov - CTO | Outbound Infrastructure & Deliverability Engineering | MailDeck" description: "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." canonical: "https://maildeck.co/authors/nikita-stoletov" last-updated: "2026-08-22" --- > 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. [← Back to Blog](https://maildeck.co/blog) Nikita Stoletov # 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. [LinkedIn](https://linkedin.com/in/nikita-stoletov) MailDeck MailDeck · Enterprise Email Infrastructure ARTICLES BY NIKITA STOLETOV [Guide](https://maildeck.co/blog/cold-email-agency-inbox-management) ## [Cold Email for Agencies: How to Manage 500+ Inboxes Without Burning Domains](https://maildeck.co/blog/cold-email-agency-inbox-management) [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...](https://maildeck.co/blog/cold-email-agency-inbox-management) [Apr 18, 2026](https://maildeck.co/blog/cold-email-agency-inbox-management) [13 min read](https://maildeck.co/blog/cold-email-agency-inbox-management) [Guide](https://maildeck.co/blog/cold-email-at-scale) ## [Cold Email at Scale: What Happens After 100K Emails/Month](https://maildeck.co/blog/cold-email-at-scale) [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+ ...](https://maildeck.co/blog/cold-email-at-scale) [Mar 24, 2026](https://maildeck.co/blog/cold-email-at-scale) [13 min read](https://maildeck.co/blog/cold-email-at-scale) [Guide](https://maildeck.co/blog/cold-email-deliverability-checklist) ## [Cold Email Deliverability Checklist: 15-Point Audit Template [Free]](https://maildeck.co/blog/cold-email-deliverability-checklist) [Copy-paste deliverability checklist based on 50M+ emails/month across 3,000+ domains. 15 infrastructure, DNS, and campaign checks that maintain 98% inbox placem...](https://maildeck.co/blog/cold-email-deliverability-checklist) [Apr 20, 2026](https://maildeck.co/blog/cold-email-deliverability-checklist) [21 min read](https://maildeck.co/blog/cold-email-deliverability-checklist) [Guide](https://maildeck.co/blog/cold-email-domain-rotation) ## [Cold Email Domain Rotation: When and How to Rotate Sending Domains [2026]](https://maildeck.co/blog/cold-email-domain-rotation) [10-20% of cold email domains burn monthly at scale. Complete domain rotation strategy with specific thresholds, timelines, and recovery protocols based on data ...](https://maildeck.co/blog/cold-email-domain-rotation) [Apr 06, 2026](https://maildeck.co/blog/cold-email-domain-rotation) [21 min read](https://maildeck.co/blog/cold-email-domain-rotation) [Guide](https://maildeck.co/blog/cold-email-domain) ## [How to Choose a Domain for Cold Email: The Complete 2026 Guide](https://maildeck.co/blog/cold-email-domain) [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 ...](https://maildeck.co/blog/cold-email-domain) [May 03, 2026](https://maildeck.co/blog/cold-email-domain) [18 min read](https://maildeck.co/blog/cold-email-domain) [Guide](https://maildeck.co/blog/cold-email-infrastructure-audit) ## [How to Audit Your Cold Email Infrastructure in 30 Minutes](https://maildeck.co/blog/cold-email-infrastructure-audit) [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...](https://maildeck.co/blog/cold-email-infrastructure-audit) [May 05, 2026](https://maildeck.co/blog/cold-email-infrastructure-audit) [20 min read](https://maildeck.co/blog/cold-email-infrastructure-audit) [Guide](https://maildeck.co/blog/cold-email-infrastructure-diversification) ## [Cold Email Infrastructure Diversification: Why One Provider Isn't Enough](https://maildeck.co/blog/cold-email-infrastructure-diversification) [Data from 833K+ inboxes shows diversified infrastructure delivers 15-50% better inbox placement than single-provider setups. The 50/30/20 ratio explained.](https://maildeck.co/blog/cold-email-infrastructure-diversification) [Apr 22, 2026](https://maildeck.co/blog/cold-email-infrastructure-diversification) [12 min read](https://maildeck.co/blog/cold-email-infrastructure-diversification) [Guide](https://maildeck.co/blog/cold-email-warm-up-what-actually-works-2026) ## [Cold Email Warm Up: What Actually Works in 2026](https://maildeck.co/blog/cold-email-warm-up-what-actually-works-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-...](https://maildeck.co/blog/cold-email-warm-up-what-actually-works-2026) [Apr 16, 2026](https://maildeck.co/blog/cold-email-warm-up-what-actually-works-2026) [19 min read](https://maildeck.co/blog/cold-email-warm-up-what-actually-works-2026) [Guide](https://maildeck.co/blog/instantly-ai-review-2026) ## [Instantly.ai Review 2026: Detailed Sequencer Breakdown From 50M+ Emails Monthly](https://maildeck.co/blog/instantly-ai-review-2026) [Infrastructure-first Instantly.ai breakdown covering pros, cons, campaign setup, pricing, and competitor comparison. Based on managing 50M+ emails monthly acros...](https://maildeck.co/blog/instantly-ai-review-2026) [Apr 27, 2026](https://maildeck.co/blog/instantly-ai-review-2026) [15 min read](https://maildeck.co/blog/instantly-ai-review-2026) [Guide](https://maildeck.co/blog/shared-ip-vs-dedicated-ip-cold-email) ## [Shared IP vs Dedicated IP for Cold Email: What Actually Affects Deliverability](https://maildeck.co/blog/shared-ip-vs-dedicated-ip-cold-email) [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...](https://maildeck.co/blog/shared-ip-vs-dedicated-ip-cold-email) [Apr 30, 2026](https://maildeck.co/blog/shared-ip-vs-dedicated-ip-cold-email) [18 min read](https://maildeck.co/blog/shared-ip-vs-dedicated-ip-cold-email) [Guide](https://maildeck.co/blog/smtp-error-codes-cold-email) ## [SMTP Error Codes in Cold Email: What Each Code Means for Your Deliverability](https://maildeck.co/blog/smtp-error-codes-cold-email) [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.](https://maildeck.co/blog/smtp-error-codes-cold-email) [May 01, 2026](https://maildeck.co/blog/smtp-error-codes-cold-email) [20 min read](https://maildeck.co/blog/smtp-error-codes-cold-email) [Guide](https://maildeck.co/blog/spf-dkim-dmarc-cold-email-guide) ## [SPF, DKIM, DMARC for Cold Email: The Complete DNS Setup Guide with Error Analysis](https://maildeck.co/blog/spf-dkim-dmarc-cold-email-guide) [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.](https://maildeck.co/blog/spf-dkim-dmarc-cold-email-guide) [Mar 31, 2026](https://maildeck.co/blog/spf-dkim-dmarc-cold-email-guide) [13 min read](https://maildeck.co/blog/spf-dkim-dmarc-cold-email-guide)