Deliverability
- Inbox placement
- SPF · DKIM · DMARC · PTR · MTA-STS
- IP & domain reputation
- IP warm-up · ISP throttling
- Blacklist & Proofpoint removal
- Google Postmaster · Microsoft SNDS
Email deliverability and infrastructure engineer.
High-volume sending is my daily work — so I know what reputation and recovery actually take.
I run high-volume email sending every day — dozens of domains, multi-IP rotation, reputation and bounce management at scale. That operating experience is what I bring to deliverability work.
I also build the systems underneath: self-hosted mail infrastructure as reproducible code (IaC), observable with monitoring, logs, and alerts, plus data pipelines, automation, and web.
Korea-based, EU GDPR adequacy compliant, B2B only. One-time audit and recovery, or an ongoing deliverability partner.
Real projects from operating my own high-volume sending.
Dozens of sending domains with multi-IP rotation, ISP-specific rate limiting (Gmail, Naver, etc.), automated bounce & complaint suppression, and reputation-based send control (AIMD) with warm-up.
SPF (10-lookup safe), DKIM, and a DMARC path to p=reject. DMARC report aggregation (parsedmarc) to discover every sending source, with subdomain separation for marketing / sales / transactional.
Full mail stack (SMTP, spam filtering, sending, monitoring, bounce, security) built and deployed as 17 Ansible modules — bounce-collection daemon, audit logging, and blacklist monitoring automated.
Extract and de-duplicate emails from CSV / XLSX and classify providers via MX records. Async DNS (200 workers) with SQLite caching batch-processes 100K+ records.