Postbox Consultancy Services (OPC) Private Limited

Email Deliverability & Infrastructure Experts We help businesses scale email marketing with high inbox placement, robust infrastructure, and data-driven strategies. Whether transactional, marketing, or affiliate - we make sure your emails land in the inbox, not spam. --- Our Core Services 📬 Email Deliverability Consulting * Deliverability audits & diagnostics * Inbox placement optimization * Spam score reduction * Email best practices implementation * IP & domain reputation management * Email list hygiene & verification We work with industry tools like MxToolBox, Validity Everrest (ReturnPath, 250ok), EmailOnAcid, and more. --- ⚙️ Large-Scale Email Infrastructure Setup (MTA) We design and deploy high-performance, scalable email sending systems: * PowerMTA (Port25) * GreenArrow (Engine, Studio, Monitor) * MailerQ, EmailSuccess * Postfix, Zimbra, hMailServer * Postal, iRedMail ✔ Complete setup, optimization & scaling ✔ IP rotation, warmup & reputation strategy --- 🚀 Email Platform & Tool Implementation Self-hosted & SaaS platforms: * MailWizz, Mumara, Sendy, Mautic, Interspire Third-party integrations: * Klaviyo, Mailchimp, Amazon SES * SendGrid, Mailgun, Elastic Email * Customer.io, Infusionsoft * GetResponse, Sendinblue, SparkPost Cold outreach tools: * Smartlead, Apollo.io, Instanly, Mailshake, Reply.io, Klenty, SalesHandy Workspace setups: * Google Workspace, Office365, Zoho Mail --- 📈 Email Marketing Strategy * Campaign planning & execution * Affiliate email marketing strategy & setup * Lifecycle automation (welcome, abandoned cart, win-back, etc.) * Performance tracking & optimization ✔ Available on retainer basis with daily/weekly reporting --- 🔥 Advanced Deliverability & Monitoring * IP & domain warmup strategies * Feedback loop setup (Google Postmaster, SNDS, Yahoo/AOL) * Seed list testing (GlockApps, Litmus, Mail-tester) * Blacklist monitoring & remediation ✔ Custom self-hosted tools: * IP blacklist monitoring systems * DMARC analytics platforms * Email verification engines --- 🧹 Email List Cleaning & Verification * Removal of invalid & risky emails * Spam trap detection * Bounce handling * Deep SMTP-level verification ✔ Option to build your own in-house verification system --- 🛠️ Technical Expertise DNS & Authentication: * SPF, DKIM, DMARC, rDNS setup * Cloudflare, AWS Route53, GoDaddy Cloud & Infrastructure: * AWS, Google Cloud, Azure * DigitalOcean, OVH, Linode, Rackspace Systems & Virtualization: * Linux (CentOS, Ubuntu, RedHat), Windows * VMware, VirtualBox, Citrix --- 💡 Why Choose Us? * Proven expertise in high-volume email systems * Strong focus on deliverability & compliance * Ability to build fully self-hosted solutions * End-to-end support: strategy → setup → execution → optimization --- If you're struggling with low inbox rates, scaling issues, or poor campaign performance, we can help you fix it - and scale it.