The 550 5.7.0 local policy violation: What it means and how to fix it

If you keep seeing “550 5.7.0 local policy violation” errors, it means the recipient’s email server has rejected your message because it failed one of their security or authentication rules. In many cases, the error appears as “550 5.7.0 email rejected per SPF policy” or a more generic “550 5.7.0 SMTP error.”

Some of these decisions are triggered by your SPF configuration. Others are entirely driven by the recipient’s system filters. The trick is to separate what you can fix and what you can only influence.

This guide explains what the “550 5.7.0 local policy violation” error actually means, the most common causes, and practical steps you can take to resolve and prevent it.

What does “550 5.7.0 local policy violation” actually mean?

The error code is made up of two parts. The “550” tells you that this is a permanent failure: The recipient server has decided it won’t accept the message and won’t try again. The “5.7.0” indicates a policy-related rejection.

When you see wording like “550 5.7.0 local policy violation” or “550 5.7.0 email rejected per SPF policy,” the recipient is effectively saying: “We’ve checked this message against our policies, and it didn’t meet the criteria to be accepted.”

You are most likely to encounter these errors with large providers such as Gmail and Outlook. Each environment might report the same 550 5.7.0 SMTP error in slightly different wording, but the message is the same: A policy violation has blocked your email.

Common causes of 550 5.7.0 and “email rejected per SPF policy”

Although 550 5.7.0 can cover a range of scenarios, three themes cause most of the pain: Broken SPF, incomplete SPF, and strict filtering.

SPF problems behind “550 5.7.0 email rejected per SPF policy”

A large portion of “550 5.7.0 local policy violation” errors can be traced back to SPF. Even when teams believe their DNS and authentication are “correct,” subtle issues in SPF often tell a different story.

Sometimes the problem is that SPF is simply missing or invalid. If there’s no SPF record, if v=spf1 is missing, or if you have multiple SPF records on the same domain, many receiving servers will choose to reject messages with a 550 5.7.0 SMTP error.

In other cases, SPF exists but is incomplete. Modern environments rarely send from just one place. You might have a primary email server, marketing platform, CRM, ticketing system, and application server all sending from the same domain.

If any of those IPs or services are left out of your SPF record, messages from them will fail SPF checks and are likely to trigger “550 5.7.0 email rejected per SPF policy”.

There is also the issue of SPF fragility. As you add more providers, your record can grow until it exceeds the 10 DNS lookup limit. At that point, receivers may see a permanent error (PermError). This will be treated as an SPF failure, which will result in a 550 5.7.0 local policy violation.

Attachments, reputation, and third-party tools

Not every 550 5.7.0 error is about SPF. Corporate filters often combine rules about attachments, IP reputation, and third-party tools.

In these situations, the error will still use the 550 5.7.0 SMTP code. You still need to treat it as a policy violation, but the fixes involve changing what you send or where it’s sent from, not just how it’s authenticated.

Fixing 550 5.7.0 local policy violation

Before you escalate to the recipient’s IT team or blame their filters, you should rule out everything that’s under your control. Which is SPF.

Rectify and optimize your SPF record

Begin by checking your current SPF record. Confirm that there’s exactly one TXT record that begins with v=spf1. If you see multiple records or no SPF at all, you’ve already identified the problem.

Next, review the syntax. Check that the syntax is valid, that there aren’t obvious typos, and that the record ends with a sensible qualifier (for example, -all or ~all). Clean up any references to old senders or unused infrastructure.

Then take a step back and map your real-world senders. List out every system that can send as your domain: Your main email service, marketing platform, CRM, support desk, billing system, etc.

Once you’re confident that the right systems are included, look at the SPF lookup count. If you’re close to or above the 10-lookup limit, simplify the record with SPF flattening. The goal is an SPF record that authorizes everything you actually use, nothing you don’t, and stays well within the query limit.

Finally, test.

Use Sendmarc’s SPF checker to analyze your current record and see whether misconfiguration is behind your 550 5.7.0 local policy violation errors. If you want deeper visibility and automated monitoring, book a demo with Sendmarc. We’ll help you understand your SPF issues and keep your configuration stable over time.

When the problem is the recipient’s local policy

Even with a clean SPF record, you may still encounter 550 5.7.0 SMTP errors that are caused entirely by the recipient’s system filters. The most effective next step is to contact the recipient’s email administrator. For critical correspondence, you can request temporary whitelisting while you work on a solution.

Best practices to prevent future 550 5.7.0 errors

Once the immediate problem is resolved, the focus should shift to preventing new 550 5.7.0 local policy violation errors.

Treat SPF as ongoing work, not a once-off project. Whenever you add or remove a third-party sender, update the record and re-validate it. Periodically review the DNS lookups, so you don’t near the 10-lookup limit.

Also, monitor deliverability and reputation. Pay attention to error messages and trends. If a particular server starts returning more 550 5.7.0 SMTP errors, investigate before it escalates into a widespread issue.

Review your domain’s SPF setup, then use Sendmarc’s SPF solution to catch misconfigurations before they affect deliverability. Book a demo to see how continuous oversight keeps critical email flowing and reduces the risk of local policy violations.