DEV Community: Maria Khan

How SPF, DKIM, and DMARC Work Together to Improve Email Deliverability

Maria Khan — Thu, 30 Jul 2026 03:40:15 +0000

Sending an email is easy. Making sure it actually reaches the recipient's inbox is much harder.

For businesses, startups, and developers managing professional email, authentication standards such as SPF, DKIM, and DMARC are an important part of email security and deliverability.

These three protocols work together to help receiving mail servers determine whether an email is legitimate, whether it was authorised by the domain owner, and what should happen when authentication checks fail.

In this guide, we'll explain what SPF, DKIM, and DMARC are, how they work together, and why configuring all three correctly matters.

What Is Email Authentication?

Email authentication is a set of techniques used to verify the identity of a sender.

Without authentication, attackers can impersonate legitimate domains in phishing and spoofing attacks. For example, an attacker could send a message that appears to come from billing@yourcompany.com without actually controlling yourcompany.com.

SPF, DKIM, and DMARC give receiving mail systems information they can use to evaluate whether a message is legitimate.

What Is SPF?

SPF stands for Sender Policy Framework.

SPF allows a domain owner to publish a DNS record specifying which mail servers are authorised to send email on behalf of that domain.

An SPF record is published as a DNS TXT record. A simplified example looks like this:

v=spf1 include:example-mail-provider.com ~all

The exact record depends on which email services your organisation uses to send mail.

How SPF Works

Suppose your company sends mail from example.com.

When a receiving mail server receives a message claiming to come from your domain, it can check your domain's SPF record and determine whether the sending server is authorised.

If the sending server is included in the SPF policy, the SPF check can pass. If it isn't authorised, the SPF check can fail.

Why SPF Matters

SPF helps domain owners identify authorised sending infrastructure and can reduce unauthorised use of their domain.

However, SPF alone isn't enough. It focuses on the sending infrastructure and doesn't provide the complete authentication and policy framework that businesses need.

That's where DKIM and DMARC come in.

What Is DKIM?

DKIM stands for DomainKeys Identified Mail.

DKIM adds a digital signature to outgoing email.

The sending mail server uses a private cryptographic key to generate the signature, while the corresponding public key is published in the domain's DNS records.

When the recipient's mail server receives the message, it can retrieve the public key and verify the signature.

In simple terms:

Private key → signs the message

Public key → verifies the signature

This helps the receiving server determine whether the message was signed correctly and whether relevant parts of the message were altered after signing.

What Does a DKIM Record Look Like?

A DKIM public key is typically published under a selector.

For example:

selector1._domainkey.example.com

The DNS record contains the public key and other DKIM parameters. The exact record is generated by your email provider or mail server administrator.

What Is DMARC?

DMARC stands for Domain-based Message Authentication, Reporting, and Conformance.

DMARC builds on SPF and DKIM.

It allows a domain owner to publish a policy that tells receiving mail systems how to handle messages that fail DMARC authentication requirements. It can also provide reporting information to help domain owners monitor email activity.

A basic DMARC record might look like this:

v=DMARC1; p=none; rua=mailto:dmarc@example.com

There are three commonly used DMARC policies.

1. `p=none`

The receiving server is asked not to apply a specific enforcement action.

This is commonly used during the monitoring stage while an organisation identifies legitimate sending sources.

2. `p=quarantine`

Messages that fail the DMARC policy may be treated as suspicious, such as being placed in a spam or junk folder.

3. `p=reject`

Messages that fail the DMARC policy can be rejected by receiving mail systems.

A strict policy should be introduced carefully because legitimate sending sources need to be identified and configured correctly first.

How SPF, DKIM, and DMARC Work Together

The easiest way to understand these three protocols is to think of them as complementary layers of email authentication.

SPF asks:

Is this sending server authorised for the domain?

DKIM asks:

Does the message contain a valid cryptographic signature?

DMARC asks:

Does the message satisfy the domain's authentication and alignment requirements, and what should happen if it doesn't?

Together, they provide a stronger authentication framework than relying on only one of these technologies.

SPF vs DKIM vs DMARC

Technology	Main Purpose	Uses DNS?	Helps With Spoofing?
SPF	Authorises sending servers	Yes	Yes
DKIM	Verifies a cryptographic email signature	Yes	Yes
DMARC	Applies policy, alignment, and reporting	Yes	Yes

These technologies are complementary rather than competing alternatives.

Why SPF Alone Isn't Enough

One common mistake is assuming that an SPF record completely protects a domain from spoofing.

It doesn't.

SPF checks whether the sending infrastructure is authorised. It doesn't provide the complete message-signing and policy capabilities provided by DKIM and DMARC.

There can also be situations where a legitimate message passes SPF but doesn't satisfy DMARC alignment requirements.

That's why SPF, DKIM, and DMARC should be treated as one complete email authentication strategy.

Why DKIM Matters for Email Deliverability

DKIM gives receiving systems a way to cryptographically verify a message's signature.

This becomes especially important when businesses use multiple email platforms, such as marketing tools, CRM systems, help desks, or transactional email services.

Each legitimate sending source should be reviewed and configured correctly.

A missing or incorrectly configured DKIM record can cause authentication problems.

Why DMARC Is Important for Businesses

DMARC gives domain owners more control over unauthorised email using their domain.

DMARC reporting can also help organisations discover email sources they may not have known were sending messages on their behalf.

For example, a company might discover that a third-party application is using its domain to send email. The organisation can then determine whether that source is legitimate and configure it correctly.

A Practical Email Authentication Checklist

If you're setting up email authentication for a business domain, work through these steps.

Step 1: Create Your SPF Record

Identify every legitimate service that sends email using your domain.

Then create an SPF record that authorises the appropriate sending services.

Step 2: Configure DKIM

Generate or obtain DKIM credentials from your email provider.

Publish the required public key in DNS and verify that outgoing messages are being signed correctly.

Step 3: Create a DMARC Record

Start with a monitoring policy while you identify legitimate sending sources.

For example:

v=DMARC1; p=none

Step 4: Review Authentication Reports

Look for both legitimate and unauthorised sources sending email for your domain.

Step 5: Fix Legitimate Authentication Failures

Before moving to a stricter DMARC policy, make sure your legitimate email services are correctly configured.

Step 6: Consider Stronger Enforcement

Once you understand your legitimate sending sources and authentication is working reliably, you can consider moving toward quarantine or reject, depending on your requirements.

Common SPF, DKIM, and DMARC Mistakes

1. Creating Multiple SPF Records

A domain should not have multiple independent SPF records.

SPF mechanisms should be consolidated into one valid SPF policy.

2. Forgetting Third-Party Email Services

Marketing platforms, CRM systems, support tools, and transactional email providers can all send messages on behalf of your domain.

If legitimate services aren't configured correctly, their messages can fail authentication.

3. Publishing the Wrong DKIM Key

A typo in the selector, hostname, or public key can cause DKIM verification to fail.

4. Enforcing DMARC Too Quickly

Moving directly to p=reject without identifying legitimate sending sources can potentially cause legitimate messages to be rejected.

Monitoring first is usually the safer approach.

5. Assuming Authentication Guarantees Inbox Placement

SPF, DKIM, and DMARC are important, but authentication alone doesn't guarantee inbox placement.

Sender reputation, message content, recipient engagement, sending behaviour, infrastructure, and other factors can also affect email deliverability.

How Developers Can Check Email Authentication

Developers and administrators can inspect DNS records using standard command-line tools.

For SPF:

nslookup -type=TXT example.com

or:

dig TXT example.com

For DKIM, you'll need the selector:

dig TXT selector1._domainkey.example.com

For DMARC:

dig TXT _dmarc.example.com

These commands can help verify whether the expected DNS records are publicly available.

SPF, DKIM, and DMARC Are a Team

It's tempting to think of SPF, DKIM, and DMARC as three separate technologies.

A better way to understand them is as complementary layers.

SPF identifies authorised sending infrastructure.

DKIM provides cryptographic verification.

DMARC adds domain alignment, policy enforcement, and reporting.

When configured correctly, together they provide a stronger foundation for protecting a business domain from spoofing and improving email authentication.

For a deeper technical walkthrough, see Mailafiniti's SPF, DKIM & DMARC Setup Guide.

Final Thoughts

Authentication is one of the most important technical foundations of email deliverability, although it isn't the only factor.

If you're responsible for a business domain, start by identifying every legitimate service that sends mail on your behalf. Configure SPF and DKIM correctly, then use DMARC to monitor authentication before gradually strengthening your policy.

You can also check your domain's current email authentication configuration with Mailafiniti's free Email Health Check, which checks SPF, DKIM, DMARC, and MX records.

The key takeaway is simple:

SPF tells receiving servers who can send. DKIM helps verify the message. DMARC brings authentication and policy together.

How to Set Up Professional Business Email Without Breaking Your Budget

Maria Khan — Fri, 03 Jul 2026 19:36:18 +0000

If you've ever launched a side project or a small SaaS, you know the drill: buy a domain, spin up hosting, ship the MVP... and then get stuck on something as "simple" as business email.
Most people default to Google Workspace or Microsoft 365 without checking the actual math. At $6–12 per user per month,
Here's how to think about business email properly, and how to set it up without overpaying.
Why yourname@gmail.com hurts more than it saves
Free email feels free, but it costs you trust. A @gmail.com or @yahoo.com address on an invoice, a cold outreach email, or a support reply signals "not a real business" to a lot of people — clients, investors, even other developers evaluating your tool.
A custom domain email (you@yourcompany.com) is one of the cheapest credibility upgrades you can buy.
What you're actually paying for
When you buy Google Workspace or Microsoft 365, you're not just paying for email. You're paying for:
A full office suite (Docs, Sheets, Slides / Word, Excel, Teams)
Cloud storage (15GB–1TB+ depending on tier)
Admin console and user management
Email hosting itself
If all you need is reliable, deliverable business email — not another Docs/Sheets subscription competing with tools you already use — you're paying for a lot of unused surface area.
What actually matters in an email provider
Strip away the bundled apps and focus on the fundamentals:
Deliverability — proper SPF, DKIM, and DMARC setup out of the box, so your emails land in inboxes, not spam folders
Uptime — email going down during a client conversation is a bad look
IMAP/SMTP support — so it works with whatever client you already use (Gmail app, Outlook, Apple Mail, Thunderbird)
Straightforward pricing — per-mailbox cost with no forced bundling
Quick deliverability primer
If you're setting up email for a new domain, these three DNS records are non-negotiable:
Code
Skip these and your cold emails, invoices, and password resets have a real chance of landing in spam — regardless of which provider you are
Before you default to the $12/user/month plan out of habit, ask: do I need the office suite, or do I need my email to work and land in inboxes? For a lot of early-stage teams, the honest answer is the latter — and that's a much cheaper problem to solve.

Business Email Hosting: Why It’s Essential for Building Trust in Modern Businesses

Maria Khan — Tue, 16 Jun 2026 15:09:54 +0000

In today’s digital economy, communication plays a major role in how customers perceive a brand. One of the most overlooked elements of this communication is business email hosting.

Whether you are a startup, freelancer, or small business, your email address is often the first impression you make. And that impression directly impacts trust, credibility, and brand authority.

Many businesses still rely on free email services like Gmail or Yahoo, but this can limit professional growth and weaken brand perception.

What is Business Email Hosting?
Business email hosting is a service that allows businesses to create professional email addresses using their own domain name, such as:

name@yourcompany.com

Instead of using generic email providers, companies use secure email hosting systems designed for business communication.

This setup is also known as:

Professional email hosting
Custom domain email hosting
Corporate email hosting solution
Business Email Hosting vs Free Email Services
Understanding the difference between free email services and professional email hosting is key for startups and growing businesses.

FeatureFree Email (Gmail/Yahoo)Business Email HostingEmail formatname@gmail.comname@company.comProfessional branding❌ None✅ Strong brand identityBusiness credibilityLowHighEmail deliverabilityModerateHigher inbox placementSecurity featuresBasicAdvanced spam & phishing protectionTeam managementLimitedFull control & admin toolsScalabilityNot suitable for teamsBuilt for business growth

Why Business Email Hosting Matters for Trust and Branding

Builds Business Credibility
Using a professional email address instantly improves how your business is perceived. Customers are more likely to trust a company that uses a branded email domain.
Strengthens Brand Identity
Every email you send reinforces your brand identity and business name, making your company look more established and consistent across all communication channels.
Improves Email Deliverability
With proper email hosting for business, your emails are less likely to land in spam folders. This improves communication with clients, leads, and partners.
Enhances Security and Protection
Modern business email hosting providers include security features such as:

Spam filtering
Virus protection
Email encryption
Domain authentication (SPF, DKIM, DMARC)
https://mailafiniti.com is affordable for it.

Supports Business Growth As your company grows, email hosting allows you to:

Add new team members easily
Manage multiple accounts
Scale communication systems without disruption
Real-Life Example: Free Email vs Business Email Hosting
Let’s compare two startups reaching out to a potential client.

❌ Example 1: Free Email
Sender: startupgrowth2024@gmail.com

Write on Medium
Even if the offer is strong, the client may think:

Is this a real business?
Can I trust this sender?
Why don’t they have a professional domain?
This reduces trust and response rate.

✅ Example 2: Business Email Hosting
Sender: contact@startupgrowth.com

Now the perception changes:

This looks like a registered company
It feels more professional and reliable
The business appears more established
👉 Same message, but completely different credibility impact

Common Mistakes Businesses Make
Many startups delay switching to professional business email hosting and continue using free email accounts. This leads to:

Lower customer trust
Weak brand identity
Poor email marketing performance
Reduced credibility in partnerships
Switching early helps avoid these limitations.

Choosing the Right Business Email Hosting Provider
When selecting a business email hosting solution, consider:

Easy setup for non-technical users
Strong security and encryption
High uptime reliability
Good email deliverability rates
Scalability for growing teams
Affordable pricing plans
A good provider should simplify email management, not complicate it.

How MailAfiniti Simplifies Business Email Hosting
MailAfiniti is designed to help startups and small businesses set up business email hosting without technical complexity.

It focuses on:

Easy custom domain email setup
Simple onboarding for non-technical users
Reliable and secure email communication
Scalable infrastructure for growing businesses
The goal is to make professional email hosting accessible for every business, regardless of technical expertise.

Conclusion
Business email hosting is more than just a technical setup — it is a key part of building trust, improving branding, and strengthening business communication.

In competitive markets, even small details like your email address can influence customer perception and business success.

A professional email system helps businesses look credible, communicate effectively, and grow faster in the digital world.

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