Salesforce DKIM Changes Explained

Did you know Salesforce is tightening email security in 2026? By 27th April 2026, any organisation that hasn’t complied risks having emails silently fail to deliver.

This isn’t just a technical update. It’s a fundamental shift in how Salesforce validates outbound email. If your domains aren’t properly verified using DKIM (DomainKeys Identified Mail) or configured as authorised sending domains, your emails may never reach customers, prospects, or internal users.

So what’s changing?

To combat spoofing and improve trust, Salesforce is enforcing mandatory domain verification.

Key deadlines:

• 9th March 2026 – Enforcement begins for new sending domains
• 7th April 2026 – Sandbox verification deadline
• 27th April 2026 – Production enforcement deadline (critical)

After this point, emails sent from unverified domains will fail delivery.

NB: If you are running development and UAT environments, you may already be affected.

Why this matters

If you rely on Salesforce for:

• Customer communications
• Marketing automation
• Case updates or service notifications
• System-generated emails

…this change directly affects your ability to operate.

The biggest risk? Emails won’t always bounce, they may simply never arrive.

Important: Who this affects

This applies to any Salesforce environment sending emails directly from its own domain.

If you’re sending via Gmail or Microsoft 365 integrations, you’re typically not affected, as those platforms handle authentication.

If you are sending emails from development or UAT environments, these require separate DKIM setup to your production environment.

Our free offer: Fast, simple compliance support

We take Salesforce security seriously and changes like this can quietly disrupt business-critical communications if missed. That’s why we’re offering a limited number of free production org checks to help teams stay ahead of the April deadline.

✅ Free Production Org Check (Limited Availability)

We will:

• Review your production org configuration
• Identify whether DKIM setup is required
• Generate the required DKIM credentials
• Provide clear instructions for your domain/DNS administrator

Cost: Free (availability is on a first come, first served basis)

Non-Production Environments

We can also review your Development, and UAT environments to ensure full compliance ahead of their earlier deadlines.

• Development & UAT environments: Priced on a case-by-case basis depending on setup complexity

What you need to do next

This is a hard deadline with real delivery impact. With the production deadline approaching fast, now is the time to act and avoid disruption.

You can find more information from Salesforce here:

1. Email Sending Domain FAQ
2. Official Salesforce Support DKIM tutorial

If you are concerned that this might affect you and need some help, simply get in touch and quote “Free Production Org Check” to set up a no obligation, no fee discussion.

By Tim Chisnall: Founder & CEO, C24

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