Common signs: emails in spam, spoofed phishing and Gmail or Outlook rejections. Usual causes: missing DKIM, broken SPF and DMARC left at none. What we do: authenticate every sender and roll out DMARC safely. What you get: passing checks and spoofing blocked.
Our SPF, DKIM and DMARC setup proves your emails are really from you, so phishing emails that fake your domain get blocked and your own emails land in the inbox. A Codersarts engineer finds every service that sends email as your domain, authenticates each one and rolls out DMARC safely. Fixed price from $29 with 24h delivery.
SPF, DKIM & DMARC Setup at a Glance
Item | Details |
|---|---|
Starting price | $29 for one domain and one sender |
Delivery | 24 hours for basic setup |
Providers | Google Workspace, Microsoft 365, SendGrid, Amazon SES, Postmark, Mailgun, Mailchimp and more |
Records | SPF, DKIM, DMARC, plus MTA-STS and BIMI on request |
Rules met | Gmail, Yahoo and Outlook sender requirements |
What you get | Passing authentication and spoofing protection |
Revisions | One revision round included |
What Are SPF, DKIM and DMARC?
SPF, DKIM and DMARC are DNS records that prove email from your domain is genuine. SPF lists which servers may send for you, DKIM signs each message, and DMARC tells inboxes what to do when a message fails those checks and sends you reports about who is using your domain.
Gmail and Yahoo have required SPF, DKIM and DMARC from bulk senders since February 2024, and Microsoft introduced similar rules for Outlook.com in May 2025.
Signs You Need Email Authentication
Your emails land in spam or are rejected by Gmail or Outlook
Customers received phishing emails that looked like yours
You send from several tools and aren't sure all are set up
Your DMARC record is missing or stuck at p=none
A security questionnaire asked about DMARC
Why Email Authentication Breaks
Missing DKIM
Some sending tools were never set up with DKIM.
Broken SPF
Too many includes push SPF over its 10 DNS lookup limit, so it fails.
DMARC never enforced
DMARC is published at p=none and never moved to quarantine or reject.
Forgotten senders
CRMs, help desks and billing tools send as your domain without authentication.
Quick Checks You Can Try First
Look up your domain's SPF, DKIM and DMARC records with a free DNS checker.
Make sure you have only one SPF record, not two.
Turn on DKIM signing in Google Workspace or Microsoft 365.
Publish a DMARC record with p=none and a reporting address to start collecting data.
If the problem remains, our engineers take it from there.
How We Set Up Your Email Authentication
Audit. We find every service sending email as your domain.
SPF. We build one valid SPF record within the lookup limit.
DKIM. We enable DKIM with 2048-bit keys for each sender.
DMARC. We publish DMARC at p=none and collect reports.
Fix. We fix every legitimate sender that fails.
Enforce. We move DMARC to quarantine, then reject, on a safe timeline.
What You Get
SPF, DKIM and DMARC records set up correctly
Every legitimate sender authenticated
DMARC reporting set up
A safe plan to reach p=reject
Notes for adding new email tools later
Example result (illustrative)
A company sent email from Google Workspace, HubSpot, Zendesk and its app via SendGrid. Only Google was authenticated, and SPF exceeded the lookup limit. We fixed SPF, enabled DKIM for all four senders and moved DMARC to p=reject within five weeks with no lost email.
What Is Included and Not Included
Included | Not included |
|---|---|
One domain | Several domains (priced per domain) |
SPF, DKIM and DMARC records | Email content or deliverability campaigns |
Setup for your sending services | Fixing a blocklisted IP reputation |
DMARC rollout plan | Paid DMARC monitoring tools |
One revision round | Ongoing management |
Pricing for SPF, DKIM and DMARC Setup
Package | Best for | Starting at | Delivery |
|---|---|---|---|
Basic setup | One domain and one sender, such as Google Workspace | $29 | 24 hours |
Full setup | Every sender authenticated, DMARC at p=none with reports | $199 | 1 day |
DMARC enforcement | Monitoring and safe move to p=reject, plus MTA-STS and BIMI | $599 | 3 days of work over 2 to 6 weeks |
You get a fixed quote after we review your setup. You approve the scope before any payment.
Who This Is For
Businesses whose emails go to spam
Companies targeted by spoofed phishing
SaaS products sending transactional email
Marketing teams meeting Gmail and Yahoo bulk sender rules
Startups answering security questionnaires
What We Need From You
Access to your DNS provider, or someone who can add records
A list of tools that send email for you
Admin access to your email provider
Any recent bounce or spam reports
Code and data privacy
We sign an NDA on request, work with read-only access wherever possible, and never keep copies of your data after delivery. You own all code, reports and notes.
Key Terms Explained
SPF: Sender Policy Framework, the list of servers allowed to send for your domain
DKIM: DomainKeys Identified Mail, a digital signature on each email
DMARC: the policy that tells inboxes how to handle failed email and sends you reports
p=reject: the strictest DMARC policy, which blocks failing email
Common Mistakes We Avoid
Publishing two SPF records, which breaks both
Jumping straight to p=reject and blocking real email
Leaving DMARC at p=none forever
Forgetting tools like CRMs and help desks
Need More Than One Fix?
Need email security as part of a wider security program? See Email Security.
Related Tasks
Cloudflare WAF Setup if your DNS is on Cloudflare
Leaked API Keys & Secrets Cleanup if email service API keys were exposed
Login & Auth Hardening to protect accounts targeted by phishing
Frequently Asked Questions
Do I need SPF, DKIM and DMARC?
Yes. Gmail, Yahoo and Outlook expect them, they're required for bulk senders, and they stop attackers from spoofing your domain.
Will DMARC block my real emails?
Not if it's rolled out in stages. We start at p=none, fix every sender, and only then enforce.
How long does DMARC enforcement take?
Usually 2 to 6 weeks of monitoring, depending on how many services send for you.
Do you work with Google Workspace and Microsoft 365?
Yes, plus app email services such as SendGrid, Amazon SES, Postmark and Mailgun.
Make Your Emails Trusted Again
Email authentication is a small fix with a big effect on deliverability and phishing. Share your domain and a Codersarts engineer will set it up correctly.