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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.

MailerCrew finds exactly why your emails aren't reaching the inbox and delivers a prioritized fix plan within 48 hours. No system access needed to start.

Start Your Audit · from $397 → 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
⚡ 48-hr turnaround guaranteed. Results or your money back.
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
Recent result Deliverability score: 2/10 → 10/10 · 4 domains fixed · 12,480+ subscribers' emails now reaching the inbox · Microsoft 365 · MailerLite · Beehiiv See full case study →
The Problem
📉
Campaigns underperform with no obvious cause Open rates drop. Revenue falls. Most teams blame their copy. The real problem is inbox placement.
🚫
Transactional emails silently disappear Password resets, onboarding flows, billing alerts in spam = churn you can't explain.
🔴
Domain blacklisting destroys sender reputation Google Workspace and Microsoft 365 blacklist recoveries take weeks without expert intervention.
⚙️
Broken DNS no-one knows about Broken email authentication silently costs you inbox placement every day. Most teams have no idea it's happening.
The Cost

You're losing revenue you can't see

Most teams have a deliverability problem for months before open rates reflect it. By then the damage is done.

Get your domain checked in 48 hrs →
Platforms we work with
G
Google Workspace
M
Microsoft 365
SL
Smartlead
⚡
Instantly.ai
Kl
Klaviyo
GH
GoHighLevel
Mg
Mailgun
SG
SendGrid
Pm
Postmark
SES
Amazon SES
CF
Cloudflare DNS
MX
MxToolbox
Bh
Beehiiv
ML
MailerLite
Ap
Apollo.io
AC
ActiveCampaign
LL
Lemlist
Rp
Reply.io
Br
Brevo
Mc
Mailchimp
Hs
HubSpot
Kit
Kit
Wp
Woodpecker
ZM
Zoho Mail
G
Google Workspace
M
Microsoft 365
SL
Smartlead
⚡
Instantly.ai
Kl
Klaviyo
GH
GoHighLevel
Mg
Mailgun
SG
SendGrid
Pm
Postmark
SES
Amazon SES
CF
Cloudflare DNS
MX
MxToolbox
Bh
Beehiiv
ML
MailerLite
Ap
Apollo.io
AC
ActiveCampaign
LL
Lemlist
Rp
Reply.io
Br
Brevo
Mc
Mailchimp
Hs
HubSpot
Kit
Kit
Wp
Woodpecker
ZM
Zoho Mail
1 in 6
emails never reaches the inbox
Source: Validity Sender Score Benchmark¹
$42
average ROI for every $1 spent on email marketing
Source: DMA UK Email Marketing Report²
3–7x
open rate improvement after fixing deliverability
Based on MailerCrew client results
48hrs
to your full audit report, guaranteed
MailerCrew service commitment
Process

From broken to delivered in 3 steps

No onboarding calls. No access to your systems needed to start. Just send us your domain and we get to work.

1
Submit Your Domain

Fill in the form with your sending domain. We run a DNS, reputation, and inbox placement check. No system access needed.

Takes 2 minutes
2
Receive Your Report

Within 48 hours you get a full audit report. Every issue ranked by impact, explained in plain English with a clear next step.

48-hour delivery
3
We Fix It

Pick what to fix and we handle it: email settings, platform config, domain warmup. We monitor until you're back in the inbox.

3–7 day resolution
Services & Pricing

Choose the right level of fix

Not sure which tier? Start with the Quick Audit. 80% of clients find everything they need there.

Tier 1 · One-Time
Quick Deliverability Audit
$397
Best for: New senders, teams suspecting an issue

Audit of your sending setup, sender reputation, and inbox placement. Report in 48 hours.

  • SPF, DKIM, and DMARC verified across all sending domains
  • Blacklist check across 50+ databases (Spamhaus, Barracuda, SURBL)
  • Inbox placement test across Gmail, Outlook, and Yahoo
  • Sender score and reputation check
  • Prioritized fix list, every issue ranked by impact
  • Report in 48 hours. No system access needed.
Most Popular
Tier 2 · One-Time
Full Deliverability Audit
$749
Best for: Teams with active deliverability issues

Full audit covering authentication, sending patterns, and ESP config. Includes a 30-day remediation plan.

  • Everything in Quick Audit, plus deeper infrastructure review
  • Full ESP config review: Mailgun, SendGrid, Postmark, GoHighLevel, Klaviyo
  • Sending pattern analysis: volume, frequency, and engagement signals
  • Warmup status assessed (IP and domain)
  • 30-day inbox placement roadmap
  • 60-min strategy call to walk through findings
Tier 3 · Monthly Retainer
Monthly Monitoring & Maintenance
$899/mo
Best for: Growing SaaS

Weekly monitoring, monthly health reports, issues fixed before they hit your open rates.

  • Weekly deliverability checks, problems caught before they affect open rates
  • Continuous blacklist monitoring with immediate alerts
  • Monthly health report with action items
  • 24-hour response on any flagged issue
  • Quarterly strategy call
Tier 4 · Monthly Retainer
Full Email Infrastructure Management
$1,697/mo
Best for: Agencies, cold email teams, high-volume senders

Full management of your email infrastructure: DNS, ESP, domain warming, cold email builds. You send, we make sure it lands.

  • Everything in Monthly Monitoring, fully handled
  • DNS and ESP management across all platforms
  • Domain warming from day one
  • Cold email infrastructure: multi-domain Instantly.ai & Smartlead setups
  • New domains set up and authenticated in days
  • Dedicated Slack channel, same-day response

Which tier is right for you?

What's included Quick Audit
$397		 Full Audit
$749		 Monitoring
$899/mo		 Full Mgmt
$1,697/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 minQuarterlyMonthly

"MailerCrew was great — exactly what I needed. Diagnosed and analyzed our deliverability issues, made a plan, then executed flawlessly with great communication and immediate responsiveness."

★★★★★ Wayne Dunn · Canada · ✓ Verified Client · 3 domains fixed
🛡️
Results Guaranteed or Your Money Back

If we don't surface at least 5 actionable improvements, we refund your full payment. No questions asked.

✓ Full refund if we don't deliver ✓ No system access required to start ✓ NDA available on request ✓ 48-hour turnaround, every time
Portfolio

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 record, no enforcement, reporting broken)
  • Email signing: disabled in Microsoft 365, failing alignment on receiving servers
  • Apple Mail: "Unable to verify message signature" (legacy certificate mismatch)
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, p=reject active, reporting configured
  • Email signing: both selectors active and verified in Microsoft 365 (Jun 5, 2026)
  • Apple Mail warning resolved: certificate updated, no more security prompt
10 / 10
Inbox deliverability score · All authentication passing · Microsoft Defender: Good
12,480+
Combined subscribers
4
Domains audited
4
Root causes found
70+
Blacklists checked
1
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

Cold email infrastructure on Instantly.ai with Apollo lead sourcing (9.3K verified contacts). 9-step Zapier automation for positive-lead alerts across Sheets, Slack, and email. Full-stack deliverability monitoring.

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 was missing entirely; DKIM selector was misaligned, breaking DMARC. Both fixed in under 93 minutes from first contact.

✓ Google Postmaster Tools: shopsilvermerch.com verified
SPFDKIMDMARCGoogle PostmasterGoogle Workspace
✓ Gmail original message headers · before and after
Before: SPF NONE DMARC FAIL
Before · 6:08 AM
After: SPF PASS DKIM PASS DMARC PASS
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 DMARC records consolidated. Strict enforcement applied, domain spoofing blocked. Email delivered in 6 seconds after fix.

MxToolboxDMARCSPFDNSMicrosoft 365
✓ MxToolbox report + Gmail header · before and after
selfcraft.me SPF DKIM DMARC all passing
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
Beehiiv newsletter dashboard - 9460 subscribers 62% open rate
⚡
Klaviyo · Abandoned Cart Flow
Abandoned cart automation with email + SMS paths. Conditional splits by SMS consent and cart value ($50 threshold). 4 emails + 3 SMS over 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 in GHL (Danson, HK). Reply tracking enabled, sending from client domain for better inbox placement.
GoHighLevelSMTPGmail
GoHighLevel email services SMTP configuration
🔧
theflowsgroup.com · Relay Fix
Emails rejected with "554 5.7.1: Relay access denied." Root cause: relay misconfiguration. Post-fix: all emails authenticated, SPF/DKIM/DMARC passing on every send.
SMTPRelayDMARC
theflowsgroup.com relay fix - before and after
📊
Google Postmaster · Domain Health
Google Postmaster set up post-fix: domain reputation, IP reputation, spam ratio, and delivery error tracking across sender domains.
Google PostmasterMonitoring
Google Postmaster domain reputation after fix
Client Reviews

What clients say

Every review is from a real client. Quotes are unedited and directly attributable. Hover any card to pause.

★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
★★★★★
✓ Verified Client

"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
Mehedi Hasan, Founder, MailerCrew
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, and Klaviyo certified, with a background in network protocols and email authentication. That's how we find what others miss.

We've worked with SaaS teams, agencies, and e-commerce brands across every major email platform.

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 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
Full deliverability report within 48 hours, every issue ranked by impact.
16+
Email platforms supported
Google Workspace, Microsoft 365, Mailgun, SendGrid, Postmark, GoHighLevel, Klaviyo, Instantly.ai, Smartlead, Beehiiv, 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.
Auth fixes (SPF/DKIM/DMARC): 24–48 hours. Blacklist removal: 3–10 days. Reputation recovery: 2–6 weeks. Domain warming: 3–6 weeks. We give you a specific timeline in the audit.
Yes, both are regular work for us. Google Workspace (including Postmaster Tools) and Microsoft 365 / Exchange Online each have their 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. If we don't identify at least 5 actionable improvements, we refund your full payment. No questions asked. 200+ audits back that guarantee.
A $397 audit typically pays for itself in the first campaign after the fix. It covers a manual review of your sending setup, 50+ blacklist checks, inbox placement across Gmail, Outlook, and Yahoo, and a prioritized fix plan. If we don't find 5+ improvements, full refund. The risk is ours.
Yes. All client data is strictly confidential. Need a formal NDA before we start? Just ask and we'll send one before anything is shared.
Ready to fix your deliverability?

Start your audit.
See results in 48 hours.

No system access required. Guaranteed results or your money back.

🔍
Start Your Audit · from $397

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

What happens next:
✓ We review your domain within 4 hours
✓ You get a full audit report within 48 hours
✓ We email you findings and next steps

🛡️ 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. 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.