Expert AI Email Deliverability and Email Security Consulting for Growth-Focused Businesses
Transform your email deliverability and email security with cutting-edge AI technology and expert consultation. We ensure your messages reach the inbox, not spam folders.
Seven free tools, no signup needed. Run the checks yourself - and if something looks wrong, that is exactly what we fix.
Send one test email, get a full deliverability audit - spam score, authentication, blacklists, rendering.
Run a spam test FREECan strangers send email as your domain? Test your spoofability and BEC exposure in seconds.
Check my domain FREEIs your domain or sending IP on a blacklist? Checks the lists that actually affect delivery.
Check blacklists FREEA weekly digest of everyone sending as your domain - passes, failures and new sources.
Start monitoring FREE18 DNS and deliverability lookups in one place - SPF, DKIM, DMARC, MX, PTR and more.
Open the toolbox FREEAre your emails delivered over secure TLS? Get reports when encryption fails in transit.
Check TLS readiness FREEWhere does your mail really land? A weekly plain-English digest of inbox placement and engagement, straight from mailbox providers.
See where mail landsTrusted by 500+ clients · the free tools run the same engines as our paid audits · no account, no credit card · See all tools
From audits to full infrastructure management, we provide end-to-end email deliverability and email security services powered by AI and industry expertise.
Landing in spam, open rates sliding, or blacklisted? Diagnose it, fix it, and keep it fixed.
Learn MoreThe plumbing done right: authentication, sending domains, warmup, and the platform behind it all.
Outbound that reaches inboxes and books meetings - infrastructure, lists, copy and sending, done safely.
Stop spoofing, phishing and BEC before they reach anyone - audit it, harden it, monitor it.
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"Working with Sandeep at Postbox Services is a pleasure. He is a consummate professional who truly knows his craft. Highly recommended for any email deliverability challenge."
"Postbox Consultancy Services conducted an email deliverability audit for us and the results were outstanding. Detailed, actionable, and delivered on time."
"Sandeep and his Postbox Services team know their way around email deliverability better than anyone we have worked with. A genuine expert."
"Sandeep is seriously a genius. Fast response time, understood the problem immediately, and fixed issues that had been hurting us for months."
"Postbox Consultancy Services is extremely helpful in reaching out to the right audience. Our open rates improved significantly after their audit."
"Working with Sandeep at Postbox Services is a pleasure. He is a consummate professional who truly knows his craft. Highly recommended for any email deliverability challenge."
"Postbox Consultancy Services conducted an email deliverability audit for us and the results were outstanding. Detailed, actionable, and delivered on time."
"Sandeep and his Postbox Services team know their way around email deliverability better than anyone we have worked with. A genuine expert."
"Sandeep is seriously a genius. Fast response time, understood the problem immediately, and fixed issues that had been hurting us for months."
"Postbox Consultancy Services is extremely helpful in reaching out to the right audience. Our open rates improved significantly after their audit."
Delivery problems stem from various factors that require proper analysis. An email deliverability audit identifies the underlying issues - authentication gaps, reputation problems, content triggers, or infrastructure faults - and gives you a prioritised fix list.
Yes. We work as external consultants or auditors, assisting your internal teams in managing email delivery themselves. We train, advise, and review without needing to take over your operations.
Rates depend on your list quality, industry, content, and sending history. No honest consultant guarantees specific numbers. What we guarantee is a thorough audit, actionable recommendations, and measurable improvement in deliverability metrics.
Yes. We design and build sending systems at any scale - from startup outreach setups to enterprise-grade platforms handling tens of millions of messages per day.
It depends on your volume, compliance requirements, and budget. We evaluate options including AWS SES, dedicated SMTP providers, self-hosted MTAs, and hybrid setups - and recommend the right fit for your specific situation.
Public TLS certificate lifetimes are dropping from 398 to 47 days by 2029 - the 200-day cap is already in force. What it means for MX, MTA-STS, TLS-RPT and BIMI, and the 5-step plan to get ahead of it.
Run a free email spam test in 2 minutes: send one email, get a deliverability score out of 10, and see exactly what to fix first. No signup - step by step.
An honest 2026 comparison of four free email spam testing tools - mail-tester, Unspam, MailChecker and Postbox Mailtester. What each checks, where each stops, and which to reach for when.
Set up BIMI step by step - the DNS record, the SVG logo rules, VMC vs CMC certificates, and what Gmail, Yahoo and Apple Mail require in 2026 - plus how to get BIMI implemented if you would rather work with a consultant in India.