Cold email infrastructure & deliverability · Dhaka, Bangladesh
Your email is sending.
It is not
arriving.
Deliverability breaks in four places: the infrastructure you send from, the DNS that authenticates you, the reputation you have built, and the filters that judge you. I have spent 12+ years fixing all four — for agencies and SaaS founders running outreach at volume.
- Job success
- 98%
- Job success
- 368 reviews
- 5.0
- 368 reviews
- Contracts
- 455
- Contracts
- Years
- 12+
- Years
- 01 Infrastructure The machines that send
- 02 Authentication Proving you are you
- 03 Reputation Earning the right to send
- 04 Placement Landing in the inbox
Four stages. Your problem lives in one of them.
Symptoms
You are probably here because of one of these.
- Open rates collapsed and nobody changed the copy.
- New domains burn out within weeks of warmup.
- Mail lands in Promotions, Spam, or nowhere at all.
- Volume went up and deliverability went down.
- A blacklisting appeared and you cannot trace the source.
- Your MTA works, but you cannot prove it is configured right.
The delivery path
Where email breaks, and what I do about it
Every engagement starts by locating the failure. These are the four stages a message passes through, and the work I do at each one.
A sending platform that is stable, isolated, and correctly tuned for the volume you actually send.
What it looks like when it breaks
Mail queues stall, throughput caps out, or one bad campaign takes the whole server down.
Tools at this stage
- PowerMTA
- Postfix
- MailWizz
- Sendy
- Mautic
- Interspire
- AWS EC2
- DigitalOcean
- Linode
- Rackspace
- WHM/cPanel
- Ubuntu
- CentOS
What I do here
- PowerMTA and Postfix installation, configuration and tuning
- SMTP relay architecture with rotating IP pools
- VPS and dedicated server provisioning and hardening
- WHM/cPanel, Ubuntu and CentOS administration
- Queue, throttling and bounce-handling configuration
- High-volume systems — up to 1M emails per month
DNS records that let receiving servers verify every message you send, aligned correctly across every sending domain.
What it looks like when it breaks
Mail is rejected, quarantined, or silently filtered because the receiver cannot confirm who sent it.
Tools at this stage
- SPF
- DKIM
- DMARC
- DNS
- rDNS / PTR
- MX
- TLS
- Email Security
What I do here
- SPF, DKIM and DMARC setup and alignment
- Full DNS configuration for sending and tracking domains
- Custom return-path and bounce domain setup
- rDNS / PTR records and MX configuration
- DMARC policy rollout from monitoring through enforcement
- Configuration audits against receiver requirements
A sending history that mailbox providers trust — built deliberately, then protected as volume grows.
What it looks like when it breaks
Domains and IPs burn out, blacklistings appear, and every fresh domain degrades faster than the last.
Tools at this stage
- KleenData
- Instantly
- Targetive
- Audience segmentation
- Blacklist monitoring
- Feedback loops
What I do here
- Domain and IP warmup planning and execution
- Mailbox and inbox provisioning for outreach at scale
- List hygiene and cleaning to suppress spam complaints
- Bounce, complaint and unsubscribe loop handling
- Blacklist monitoring, delisting and root-cause tracing
- Safe volume ramp schedules across IP pools
Verified inbox placement across the providers your prospects actually use — measured, not assumed.
What it looks like when it breaks
Everything looks configured correctly, but replies never come and you cannot tell where the mail is going.
Tools at this stage
- Klaviyo
- GoHighLevel
- SendGraph
- Mailchimp
- AWeber
- GetResponse
- ConstantContact
- OptimizePress
- LeadPages
- DAP
What I do here
- Inbox placement testing across major providers
- Spam filter and content diagnosis
- Deliverability audits with prioritised remediation
- Campaign platform configuration and integration
- Ongoing monitoring and reporting
- Compliance review for cold outreach programmes
Stack
What I work with
Twelve years of email delivery and server administration, grouped the way the work actually divides.
Cold email systems
Setup built for inbox placement and compliance
- Cold email system setup
- Domain & inbox provisioning
- Warmup sequencing
- Instantly
- Targetive
- Compliance review
Email infrastructure
The mail transfer layer
- PowerMTA
- Postfix
- MailWizz
- Sendy
- Interspire
- Mautic
- SMTP relay
Server administration
Where the infrastructure runs
- WHM / cPanel
- Ubuntu
- CentOS
- Linux administration
- VPS & dedicated servers
- AWS EC2
- DigitalOcean
- Linode
- Rackspace
Authentication & DNS
Proving the sender is legitimate
- SPF
- DKIM
- DMARC
- DNS management
- rDNS / PTR
- MX records
- Email security
Marketing platforms
Where campaigns are run
- Klaviyo
- GoHighLevel
- SendGraph
- Mailchimp
- AWeber
- GetResponse
- ConstantContact
List & web platforms
Hygiene and landing infrastructure
- KleenData
- List cleaning
- Audience segmentation
- WordPress
- OptimizePress
- LeadPages
- DAP
Engagements
What clients hire me for
Drawn from 455 completed contracts on Upwork. Client names and figures stay private, but the work is representative.
-
01
PowerMTA configuration audit & remediation
Urgent review of an existing PowerMTA deployment for a SaaS platform, with a prioritised list of corrections.
- PowerMTA
- Email Deliverability
- DNS
-
02
Cold email infrastructure setup
End-to-end build: sending domains, DNS authentication, and provisioned inboxes ready for outreach.
- Domains
- DNS
- Inboxes
-
03
High-volume outreach system
Built and managed a system sending up to one million emails per month over an SMTP relay with rotating IPs.
- SMTP Relay
- Rotating IPs
- AWS
- Linux
-
04
Deliverability fix & optimisation
Diagnosed and corrected inbox placement failures on MailWizz and Mautic installations.
- MailWizz
- Mautic
- SMTP
-
05
Mail server setup & configuration
Provisioning and configuring MailWizz servers for ongoing email marketing operations.
- MailWizz
- System Administration
- Windows Server
-
06
Deliverability check & consultation
Focused sessions reviewing an existing setup and identifying what to fix first.
- Audit
- Consultation
Verified on Upwork
Top Rated Plus
Twelve years, measured
- Job success score
- 98% Job success score
- Rating from 368 reviews
- 5.0 Rating from 368 reviews
- Contracts completed
- 455 Contracts completed
- Hours delivered
- 3.1K Hours delivered
- Years in email delivery
- 12+ Years in email delivery
Working with P. J. Entrepreneur’s Innovation Incubator since 2012.
Next step
Find out where your email is actually going.
Bring your setup — sending platform, domains, current numbers — and leave with a clear read on what is broken and what to fix first.