Email Deliverability Agency · Cisco · Microsoft · HubSpot · Klaviyo Certified · 200+ Businesses Back in the Inbox

Your emails are
landing in spam.
We fix it in 48 hrs.

Most teams discover a deliverability problem after open rates crash. By then, sender reputation is damaged, pipelines are dry, and it costs 3x more to fix. MailerCrew finds exactly why your emails miss the inbox — open rates, bounces, sender reputation, and placement across Gmail and Outlook — then delivers a prioritized fix plan within 48 hours. No system access needed to start.

Start Your Audit — from $497 → Book a 15-Min Call

● Cisco CCNA · Microsoft · HubSpot · Klaviyo Certified · 200+ Businesses Back in the Inbox · 48-hr Delivery Guaranteed · No System Access Needed

⚡ We currently have 3 audit slots open this week — 48-hr turnaround guaranteed.

Deliverability Audit · client@saas.io

Inbox Placement Rate

91%

Email protectionActive ✓

Sender Score

88/100

Blacklists (52 checked)Clean ✓

AuthenticationVerified ✓

✓ All issues resolved · 4 days to full inbox placement

Services & Pricing

Choose the right level of fix

Not sure which tier? Start with the Quick Audit. 80% of clients find everything they need in the findings report. Retainers are for teams who want it handled on an ongoing basis.

Tier 1 · One-Time

Quick Deliverability Audit

^$497

Best for: New senders, teams suspecting an issue

A fast audit of your sending setup, sender reputation, and inbox placement. You get a clear report ranked by priority within 48 hours.

Your authentication verified — no emails silently failing (SPF, DKIM, DMARC on all sending domains)
Know exactly if you're blacklisted — checked across 50+ databases including Spamhaus, Barracuda, SURBL
See where your emails actually land — inbox placement test across Gmail, Outlook, and Yahoo
Your sender score exposed — know your reputation number before ISPs penalize you
A prioritized fix list you can act on — every issue ranked by impact, explained in plain English
In your hands within 48 hours — no system access needed to start

What's included	Quick Audit $497	Full Audit $1,500	Monitoring $800/mo	Full Mgmt $2,000/mo
Email authentication check	✓	✓	✓	✓
Blacklist check (50+ databases)	✓	✓	✓	✓
Inbox placement test	✓	✓	✓	✓
ESP configuration review	—	✓	✓	✓
30-day remediation roadmap	—	✓	—	✓
Ongoing weekly monitoring	—	—	✓	✓
24-hour fix response	—	—	✓	✓
Cold email infrastructure build	—	—	—	✓
Strategy call	—	60 min	Quarterly	Monthly

Real work. Real results.

Authentication fixes, cold email infrastructure, automation flows, and newsletter deliverability. Real work across multiple platforms and clients.

Case Study · Full Audit

4 Domains Fixed — 12,480+ Subscribers' Emails Back in the Inbox

4 domains · Microsoft 365 · MailerLite · Beehiiv · macOS S/MIME · 12,480+ combined subscribers

Before · Authentication Failures Detected

Suomispam blacklist: sending IP 15.197.225.XXX listed
Email protection: 4 errors + 2 warnings. Duplicate protection record causing conflicts. Policy set to no enforcement — domain fully open to spoofing. Reporting broken, missing tags
Email signing: disabled in Microsoft 365 Defender, falling back to Microsoft's generic identity (failing alignment check on receiving servers)
Apple Mail: "Unable to verify message signature" on every email. Legacy certificate with identity mismatch — recipients saw a security warning

2 / 10

Inbox deliverability score · Critical · Outlook/Hotmail filtering active

→

After · Full Authentication Stack Operational

Suomispam: delisted Jun 6, 2026. Spamhaus ZEN, Barracuda BRBL, SpamCop: all clear
Email protection: single clean record, duplicate removed. Strict enforcement active — domain fully protected against spoofing. Reporting configured for ongoing visibility
Email signing: both selectors active and verified in Microsoft 365. All outbound emails now cryptographically signed. Last checked Jun 5, 2026
Apple Mail security warning resolved: legacy certificate retired. Current certificate with correct identity bound — recipients no longer see warnings

10 / 10

Inbox deliverability score · All authentication passing · Microsoft Defender: Good

12,480+

Combined subscribers

Domains audited

Root causes found

70+

Blacklists checked

Engagement · all fixed

Microsoft 365MailerLiteBeehiivEmail Auth AuditDKIM SetupDMARC p=rejectIP DelistingS/MIME Fix

Email security and authentication verified - SPF DKIM DMARC all passing

Josh Ward · UK · Cold Email Infrastructure

47.15% open rate

25.1K emails sent · last 4 weeks

Full infrastructure: Instantly.ai cold email setup, Apollo lead sourcing (9.3K verified contacts, Operations Managers), 9-step Zapier positive-lead alert automation: Instantly triggers Sheets lookup, AI analysis, Filter, Slack channel alert, outbound email, delay, re-filter, then updates lead status back in Instantly. Deliverability monitoring across the full stack.

Zapier flow (v16, Oct 2025) Instantly → Sheets → AI Analyze → Filter → Slack → Email → Delay → Filter → Instantly

Instantly.aiApolloZapierSlackn8n

✓ Analytics + Zapier flow screenshots on file

Zapier automation flow - positive lead alert pipeline

Zapier flow v16 · Oct 2025 · Josh Ward account

Instantly.ai analytics - 25K sent 47% open rate

Instantly.ai campaign analytics

shopsilvermerch.com · Shawna Weltsch · Same-day auth fix

Apr 28 · 6:08 AM

SPF: NONE
DMARC: FAIL

→

Apr 28 · 7:41 AM

SPF: PASS
DKIM: PASS
DMARC: PASS

SPF record was missing entirely (NONE). DKIM signing was using a misaligned selector (shopsilvermerch-com.20251104.gappssmtp.com), breaking DMARC alignment. Fixed SPF and DKIM alignment. Both test emails ran within 93 minutes of engagement start.

✓ Google Postmaster Tools: shopsilvermerch.com verified

SPFDKIMDMARCGoogle PostmasterGoogle Workspace

✓ Gmail original message headers · before and after

Before · 6:08 AM

After · 7:41 AM

selfcraft.me · Hollie Wildëthorn · Email delivered in 6 seconds after fix

MxToolbox · Before

4 Errors · 2 Warnings
Duplicate DMARC record
Policy p=none, no enforcement
Brand logo not in inbox

→

Jun 7, 2026

SPF: PASS
DKIM: PASS
DMARC: PASS

Two conflicting email protection records removed and consolidated. Full enforcement applied — domain can no longer be spoofed or impersonated. Email authentication corrected and verified. Email delivered in 6 seconds post-fix. Full independent health check passed on retest.

MxToolboxDMARCSPFDNSMicrosoft 365

✓ MxToolbox report + Gmail header · before and after

Gmail header · Jun 7, 2026 · selfcraft.me

Instantly.ai · Cold email accounts managed

28.5K

Emails sent

43%

Avg open rate

66.77%

Best week open rate

$10K

Opportunity pipeline

Instantly.ai campaign analytics overview

Beehiiv · Newsletter deliverability managed

9,460

Active subscribers

62.4%

Open rate

+7,796

Subscriber growth

10.25%

Click-to-open rate

⚡

Klaviyo · Abandoned Cart Flow

Full abandoned cart automation with email + SMS paths. Conditional split by SMS consent, trigger splits by cart value ($50 threshold). 4 emails + 3 SMS across 3 days, all flows Live.

KlaviyoSMSE-commerce

Klaviyo abandoned cart email and SMS automation flow

⚙️

GoHighLevel · SMTP Config

Configured dedicated Gmail SMTP as default sending provider inside GHL for Danson account (Central, HK). Reply tracking enabled. Sending from client domain for better inbox placement.

GoHighLevelSMTPGmail

GoHighLevel email services SMTP configuration

🔧

theflowsgroup.com · Relay Fix

Client emails rejected outright — zero delivery, error "554 5.7.1: Relay access denied". Root cause identified: email relay misconfiguration. Post-fix: all emails authenticated and delivering. SPF, DKIM, DMARC all passing on every outbound send.

SMTPRelayDMARC

theflowsgroup.com relay fix - before and after

📊

Google Postmaster · Domain Health

Google Postmaster monitoring set up post-fix. Domain reputation tracking, IP reputation, spam ratio reporting, and delivery error analysis across sender domains.

Google PostmasterMonitoring

Google Postmaster domain reputation after fix

Client Reviews

What clients say

Reviews originally collected on Fiverr and Upwork. Every quote is real, unedited, and attributable. Hover any card to pause.

★★★★★

✓ Upwork Review

"MailerCrew was great — exactly what I needed. Diagnosed and analyzed our deliverability and other email issues. Made a plan to put things back in order and then executed on the plan. Did it flawlessly with great communication and immediate responsiveness. Highly recommended, will use again."

Wayne Dunn · Canada

3 domainsBlacklist removalKlaviyo

★★★★★

✓ Fiverr Review

"MailerCrew is very good at what they do. They worked quickly to resolve the issue with my domain, it took less than a day. They were responsive, kind, and offered explanations every step of the way. Will continue to work with them and highly recommend."

shawnaweltsch · United States

Domain fix<24hr turnaround

★★★★★

✓ Fiverr Review

"Emails from my private server kept bouncing, and nothing I tried worked. That's when I hired MailerCrew. They quickly identified the root cause and fixed the issue confidently. MailerCrew was a pleasure to work with, responsive, and genuinely helpful. I highly recommend them to anyone in need of reliable email deliverability support."

peterprevos · Australia

Private serverBounce fix

★★★★★

✓ Fiverr Review

"Thank you, MailerCrew! I appreciate the thorough review of my client's email account, records, and domain reputation. The work helped tremendously in uncovering what the issues were with all of our emails going to spam. They're in a good place now thanks to the review."

bradhjones · United States

Domain reputationSpam fix

★★★★★

✓ Fiverr Review

"Working with MailerCrew was a dream. They took the time to understand our situation and delivered the work promptly. They were polite, responded quickly, and were willing to go above and beyond to fix our issue. If you're struggling with your email deliverability, I couldn't recommend them enough."

robcraig08 · Ireland

Email deliverabilityAbove & beyond

★★★★★

✓ Upwork Review

Wayne Dunn · Canada

3 domainsBlacklist removalKlaviyo

★★★★★

✓ Fiverr Review

shawnaweltsch · United States

Domain fix<24hr turnaround

★★★★★

✓ Fiverr Review

peterprevos · Australia

Private serverBounce fix

★★★★★

✓ Fiverr Review

bradhjones · United States

Domain reputationSpam fix

★★★★★

✓ Fiverr Review

robcraig08 · Ireland

Email deliverabilityAbove & beyond

Mehedi Hasan

Founder, MailerCrew · Email Deliverability Agency

📍 Dhaka, Bangladesh · Serving clients globally

🔗 LinkedIn ✉ support@mailercrew.com

Most agencies know campaigns. They don't know infrastructure. When deliverability breaks, they run split tests. We check the DNS records.

MailerCrew is led by Mehedi Hasan — Cisco CCNA & CCNA Security, Microsoft, HubSpot Email Marketing, and Klaviyo Deliverability certified — with a background in network protocols and email authentication systems. That's how we find what others miss: the misconfigured SPF record, the wrong ESP setting, the reputation signal that's been hurting your placement for months.

We've worked with SaaS teams, cold email agencies, and e-commerce brands across Google Workspace, Microsoft 365, Mailgun, SendGrid, Postmark, GoHighLevel, Instantly.ai, Smartlead, and Klaviyo.

Cisco CCNA

CCNA Security

Microsoft Certified

HubSpot Email Marketing

Klaviyo Deliverability

SPF · DKIM · DMARC

Google Workspace

Microsoft 365

SendGrid · Mailgun · Postmark

GoHighLevel · Klaviyo

🔒 Confidentiality guaranteed. All client data, domain configurations, and infrastructure details are treated as strictly confidential. NDAs are available on request — just ask before we start.

200+

Domains audited and repaired

Across SaaS teams, cold email agencies, and e-commerce brands.

48h

Guaranteed audit turnaround

You get a full deliverability report within 48 hours of getting started. Every issue ranked by impact.

16+

Email platforms supported

Google Workspace, Microsoft 365, Mailgun, SendGrid, Postmark, GoHighLevel, Klaviyo, Instantly.ai, Smartlead, Apollo, Beehiiv, MailerLite, ActiveCampaign, and more.

FAQ

Common questions

Everything you want to know before getting started.

No access needed to start. The audit runs from public DNS records, blacklist databases, and inbox placement testing tools. If you want us to fix things, we ask for DNS management and ESP dashboard access only.

We work with all major platforms: Google Workspace, Microsoft 365, Mailgun, SendGrid, Postmark, Amazon SES, GoHighLevel, Klaviyo, Instantly.ai, and Smartlead. If you're using a platform not listed, ask. Chances are we've worked with it.

Yes. Cold email infrastructure is a big part of what we do. We build sending setups (dedicated domains, warmup sequences, rotation), fix placement issues, and repair damage from burned domains. We work with Instantly.ai and Smartlead regularly.

Yes. We find which blacklists your domain or IP is on, fix the underlying issue, submit removal requests, and watch for re-listing. Most are resolved within 3 to 10 days. Some blacklists are automated, others need a manual review request.

Authentication fixes (SPF, DKIM, DMARC) typically propagate within 24–48 hours after DNS changes. Blacklist removal: 3–10 days depending on the registry. Sender reputation recovery (after a major spam incident): 2–6 weeks of consistent clean sending. Domain warming for a new sending domain: 3–6 weeks. We give you a specific timeline during the audit call.

Yes, both are a regular part of our work. Google Workspace (including Postmaster Tools setup and interpretation) and Microsoft 365 / Exchange Online (DMARC alignment, Smart Network Data Services) each have their own quirks. We know both well.

The free report covers: SPF check, DKIM presence, DMARC policy status, top-3 blacklist checks (Spamhaus, Barracuda, SURBL), and a basic inbox placement signal. Enough to know if you have a problem and how serious it is. The paid Quick Audit goes deeper: 50+ blacklists, full DNS analysis, Senderscore, and inbox placement across Gmail, Outlook, and Yahoo.

For audits: if we deliver what was promised on time, the engagement is done. For retainers: cancel with 30 days notice, no lock-in. If we miss what was agreed, we redo it or refund it. Simple as that.

We've never returned an audit with zero findings — every sending setup has something that can be optimized. But if for any reason we don't identify at least 5 actionable deliverability improvements, we'll refund your full payment with no questions asked. That's our guarantee. The confidence to offer it comes from running 200+ audits across every major platform.

A $497 audit typically pays for itself in the first campaign after the fix. If your emails are landing in spam, you're losing revenue on every send — that's not a $50 problem. The audit covers a manual review of your full sending setup, blacklist status across 50+ databases, inbox placement testing across Gmail, Outlook, and Yahoo, and a prioritized written fix plan. If we don't find at least 5 actionable improvements, you get a full refund. The risk is ours, not yours.

Yes to both. We treat all client data — domain configurations, sending infrastructure, ESP credentials, campaign data — as strictly confidential. If you need a formal NDA before we start, just ask. We'll send one before any information is shared. This is standard practice for agency clients managing sensitive client data.

Ready to fix your deliverability?

Start your audit.
See results in 48 hours.

No system access required. Guaranteed results or your money back. 3 audit slots available this week.

🔍

Start Your Audit — from $497

Tell us about your setup. We'll review and reply within 24 hours with next steps and pricing.

🛡️ 5+ actionable fixes guaranteed or full refund · No system access needed to start

📅

Book a 15-Minute Discovery Call

Prefer to talk first? Book a free call. We look at your setup together and tell you exactly what we find — no commitment, no pitch.

Book a Call →

✓ Free · 15 minutes · No obligation

📋 Get My Free Deliverability Score

Enter your outgoing domain email. We run a full diagnostic and send you a report within 48 hours. No access needed, no commitment.

Sample Report

DELIVERABILITY SCORE · yourdomain.com

64 /100 ⚠ Moderate Risk

✗ Email protection not enforced — your domain can be spoofed by anyone

⚠ Sender reputation: 68/100 — approaching the threshold where Gmail starts filtering

✗ Listed on 1 blacklist — a portion of your emails are being blocked before delivery

✓ Email signing active — authentication passing on outbound mail

⚠ Inbox placement: 71% Gmail — nearly 1 in 3 emails not reaching the inbox

Full report includes 8-point diagnostic · 50+ blacklist check · Gmail, Outlook & Yahoo placement · Priority fix list

🛡️ Results guaranteed or full refund 🔒 Confidentiality guaranteed · NDA on request ⚡ Cisco · Microsoft · HubSpot · Klaviyo Certified ✉ support@mailercrew.com

Or email us directly: support@mailercrew.com · We reply within 24 hours.

Your emails are
landing in spam.
We fix it in 48 hrs.

You're losing revenue you can't see

From broken to delivered in 3 steps

Choose the right level of fix

Real work. Real results.

4 Domains Fixed — 12,480+ Subscribers' Emails Back in the Inbox

What clients say

Common questions

Start your audit.
See results in 48 hours.

Your emails arelanding in spam.We fix it in 48 hrs.

You're losing revenue you can't see

From broken to delivered in 3 steps

Choose the right level of fix

Real work. Real results.

4 Domains Fixed — 12,480+ Subscribers' Emails Back in the Inbox

What clients say

Common questions

Start your audit.See results in 48 hours.

Your emails are
landing in spam.
We fix it in 48 hrs.

Start your audit.
See results in 48 hours.