# Postbox Consultancy Services

> Email deliverability consultancy with 10+ years of experience and 500+ clients. We help businesses reach the inbox: deliverability audits, SPF/DKIM/DMARC/BIMI setup, blacklist recovery, cold email infrastructure, and ongoing email operations run as a service. We also publish a suite of free, no-login deliverability and email-security tools at https://postboxservices.com/tools.

Contact: https://postboxservices.com/contact | contact@postboxservices.com | +91 6361139611

## Expertise

- Email deliverability audits and inbox-placement recovery
- Email authentication: SPF, DKIM, DMARC and BIMI
- Anti-spoofing, DMARC enforcement, and phishing / business email compromise (BEC) protection
- Blacklist recovery and delisting
- Cold email infrastructure, domain and IP warmup
- Large-scale sending infrastructure and MTA setup
- Sender reputation and ongoing deliverability monitoring, run as a managed service

## Services

- [All services overview](https://postboxservices.com/our-services): the full catalogue of email deliverability and infrastructure services.
- [Email deliverability services](https://postboxservices.com/services/email-deliverability): audits, hourly consultations, and monthly retainer packages (Starter $99/mo, Business $299/mo, Custom) with monitoring, analysis of actual outgoing email, alerts and incident response.
- [Email infrastructure and tools](https://postboxservices.com/services/email-infrastructure): large-scale sending platforms, mail servers, SPF/DKIM/DMARC/BIMI authentication, ESP and self-hosted tool implementation, campaign management and team training.
- [Email deliverability audit](https://postboxservices.com/what-is-an-email-deliverability-audit): a full technical review of authentication, reputation, infrastructure and content, with a prioritised fix list.
- [Cold email services](https://postboxservices.com/cold-email-services): cold outreach infrastructure setup, domain and inbox warmup, and deliverability.
- [Email Team as a Service - ETaaS](https://postboxservices.com/email-team-as-a-service-etaas): an outsourced email operations team that runs deliverability, authentication and sending on an ongoing basis.
- [Email deliverability consultant for US businesses](https://postboxservices.com/email-deliverability-consultant-us-businesses): deliverability consulting for US senders.
- [BIMI implementation service](https://postboxservices.com/services/bimi-implementation/): done-for-you BIMI - DMARC to enforcement, SPF/DKIM alignment, VMC/CMC certificate guidance, SVG logo production and record publishing, verified across Gmail, Yahoo and Apple Mail. India-based, serving worldwide.
- [Anti-spoofing and BEC hardening service](https://postboxservices.com/services/anti-spoofing-bec-hardening/): close the gaps that let attackers send as your domain - DMARC to enforcement, SPF/DKIM lockdown, lookalike / cousin-domain defence, inbound BEC controls, and ongoing monitoring. India-based, serving worldwide.
- [Email security audit service](https://postboxservices.com/services/email-security-audit/): a one-time fixed-fee audit of your email attack surface (authentication, spoofability/BEC, impersonation, gateway, reputation) with a graded, cyber-insurance-ready report and prioritised fix plan. India-based, serving worldwide.

## Free tools

- [All free deliverability tools](https://postboxservices.com/tools): the hub for our free, no-login tools - domain health and DNS checks, blacklist check, DMARC and TLS-RPT monitoring, a mail tester, and a spoofing/BEC exposure check.
- [Postbox MX Tools - free email domain health check and DNS tools](https://mx.postboxservices.com): runs SPF, DKIM, DMARC, MX, BIMI, MTA-STS, TLS-RPT and DNSSEC checks and grades a domain A to F, plus individual SPF/DKIM/DMARC/BIMI/MX/PTR lookups and an email header analyzer. Free, no login.
- [Postbox Blacklist Check - free blacklist check](https://bl.postboxservices.com): checks a domain or IP against 24 blacklists (DNSBLs) including Spamhaus ZEN, Barracuda and SpamCop.
- [Postbox DMARC Monitor - free DMARC monitoring / anti-spoofing](https://dmarc.postboxservices.com): add one DNS reporting address and get a plain-English weekly report of every source sending as your domain and what passes SPF and DKIM. Free, no login.
- [Postbox Mailtester - free email deliverability audit](https://mailtester.postboxservices.com): send one email to a disposable test address and get a full technical audit - a deliverability score out of 10 plus SPF, DKIM, DMARC, domain age, Gmail and Yahoo 2024 sender-requirement compliance, blacklist, reverse-DNS, spam-content and formatting checks, with the exact fixes. Free, no login.
- [Postbox TLS-RPT Monitor - free TLS-RPT monitoring](https://tlsrpt.postboxservices.com): add one DNS record and get a plain-English weekly report on whether senders can deliver to your mail server over secure TLS, including MTA-STS policy and certificate failures. Free, no login.
- [Postbox Spoof Check - free spoofing and BEC exposure check](https://security.postboxservices.com): check whether attackers can send phishing email as your domain and get an instant A to F spoofing/BEC exposure grade from your public DNS (SPF, DKIM, DMARC and alignment). Free, no login.
- [Free spam words checker](https://postboxservices.com/spam-words): flags spam-trigger words in email copy.

## Comparisons

- [Best email deliverability consulting agencies in 2026](https://postboxservices.com/best-email-deliverability-consulting-agencies-2026): a roundup of the leading email deliverability consultancies, tools and experts, with what each is best for.
- [Email spam testing tools compared: mail-tester, Unspam, MailChecker and Postbox Mailtester](https://postboxservices.com/blogs/post/email-spam-testing-tools-compared): a 2026 comparison of four free email spam testing tools - what each checks, where each stops, and which to reach for when.

## Key guides

- [What is email deliverability](https://postboxservices.com/what-is-email-deliverability): a plain-language explainer of what deliverability is and what affects it.
- [What is an email deliverability audit](https://postboxservices.com/what-is-an-email-deliverability-audit): what an audit covers and the report you get.
- [Email deliverability checklist](https://postboxservices.com/blogs/post/email-deliverability-checklist): a step-by-step checklist covering authentication, sender reputation, list hygiene, content and infrastructure to keep mail landing in the inbox.
- [Microsoft email deliverability: the complete debugging guide](https://postboxservices.com/blogs/post/debugging-email-deliverability-to-microsoft/): field manual for mail junked or bounced by Outlook.com, Hotmail and Microsoft 365 - decodes 15 bounce codes, explains the compauth/SCL/BCL headers, covers SNDS/JMRP, the escalation paths and per-sender-type fixes, current to Microsoft's 2026 portal changes.
- [Microsoft 365 DKIM setup: the selector1/selector2 CNAMEs](https://postboxservices.com/setup-guides/microsoft-365-dkim/): step-by-step custom-domain DKIM for Microsoft 365 - the two CNAME records, the Defender portal walkthrough, and the six common failures with fixes.
- [Google Workspace DKIM setup: the google._domainkey record](https://postboxservices.com/setup-guides/google-workspace-dkim/): step-by-step custom-domain DKIM for Google Workspace - generate the key, publish the TXT record, start authentication, and the six common failures with fixes.
- [Zoho Mail SPF setup: one record, the right include](https://postboxservices.com/setup-guides/zoho-mail-spf/): step-by-step SPF for Zoho Mail - the v=spf1 include:zohomail.com record, the Admin Console verification, and the five common failures with fixes.
- [BIMI setup: publish your logo, and when you need a VMC or CMC](https://postboxservices.com/setup-guides/bimi/): step-by-step BIMI - the DMARC enforcement prerequisite, the SVG Tiny 1.2 P/S logo, the default._bimi record, and the VMC-vs-CMC decision (what displays in Gmail, Yahoo and Apple, and the blue verified check), plus the common failures.
- [BIMI setup guide: how to add your brand logo to emails](https://postboxservices.com/blogs/post/bimi-setup-guide/): step-by-step BIMI - the default._bimi DNS record, the SVG Tiny 1.2 PS logo rules, VMC vs CMC certificates, which providers display it (Gmail, Yahoo, Apple, Fastmail; not Outlook), and the five failures that keep valid setups from showing.

## Industry updates

- [Email industry updates](https://postboxservices.com/industry-updates/): a dated log of changes that affect email deliverability - mailbox-provider policy shifts, authentication standards, legal and privacy rules, blacklist and reputation news, and industry moves, each explained with what to do.
- [Gmail drops "Send as" for third-party accounts from January 2027](https://postboxservices.com/industry-updates/gmail-drops-third-party-send-as-2027/): from January 2027 Gmail removes "Send as" for non-Google addresses, Gmailify and web POP fetch for third-party accounts; what changes, who it affects, and how to move sending to a properly authenticated domain.
- [APRF: the draft standard that would show senders where their mail lands](https://postboxservices.com/industry-updates/aprf-aggregate-performance-reporting-draft/): the IETF draft draft-brotman-aggregate-performance-reporting, a DMARC-style way for mailbox providers to email senders daily JSON reports on inbox placement and engagement, keyed to the DKIM signing domain; how it works, how it differs from DMARC and Postmaster Tools, and how to try it.
- [DKIM2: a ground-up rebuild of email signing](https://postboxservices.com/industry-updates/dkim2-next-generation-email-signing/): the IETF draft draft-ietf-dkim-dkim2-spec (by engineers from Yahoo, Google and Fastmail) signs every hop, binds signatures to the SMTP envelope to stop replay, records reversible recipes so forwarding no longer breaks DMARC, and routes provable bounces up a verifiable chain; a companion draft retires ARC into it. Still a draft - do not deploy in production yet.

## Case studies

- [AI sales platform deliverability](https://postboxservices.com/ai-sales-platform-deliverability): how a B2B AI SDR platform recovered inbox placement from 43% to 81%, protecting roughly $840K of at-risk ARR, through a multi-tenant email-infrastructure rebuild and domain warmup.
- [Food media publisher deliverability](https://postboxservices.com/food-media-publisher-email-deliverability-case-study): how a culinary media brand uncovered 15 months of hidden deliverability erosion masked by inflated open rates, and rebuilt inbox placement across its editorial and Klaviyo programmes.

## Company

- [About us](https://postboxservices.com/about-us): who we are and how we work.
- [Contact](https://postboxservices.com/contact): contact@postboxservices.com, phone +91 6361139611.
- [Blog](https://postboxservices.com/blogs): articles on deliverability, authentication and email infrastructure.

## Optional

- [Free APRF record generator](https://mx.postboxservices.com/aprf-generator/): builds the _aprf._domainkey TXT record for Aggregate Performance Reporting (the draft-brotman IETF proposal), plus the destination consent record. No login.
- [Free APRF record checker](https://mx.postboxservices.com/aprf-checker/): looks up and validates a published _aprf._domainkey TXT record - the v=APRFv1 version tag, the rua reporting address, and the destination consent record. No login.
- [Hire us on Upwork](https://postboxservices.com/hire-email-deliverability-consultant-upwork).
- [Free email domain health check and DNS tools llms.txt](https://mx.postboxservices.com/llms.txt).
- [Free blacklist check llms.txt](https://bl.postboxservices.com/llms.txt).
- [Free DMARC monitor llms.txt](https://dmarc.postboxservices.com/llms.txt).
- [Free Mail Tester llms.txt](https://mailtester.postboxservices.com/llms.txt).
- [Free TLS-RPT monitor llms.txt](https://tlsrpt.postboxservices.com/llms.txt).
- [Free spoofing and BEC exposure check llms.txt](https://security.postboxservices.com/llms.txt).