Email Deliverability Troubleshooting

If you are experiencing errors when sending an email, we first recommend checking out our set up guide for sending emails with Plain.

Best Practices

Warm-up your domain

A common cause of email deliverability issues is trying to send too much, too soon. When you've just onboarded a new vendor like Plain to send emails, we recommend slowly ramping up your activity.

Use a Sub-domain for non-Support email sends

We recommend using a subdomain (like marketing.atrium.co) for non-Support customer communication.

Known Errors

550 DMARC check failed

Typically occurs if your SPF record has the -all strict flag.

550 5.7.515

This error occurs if you send more than 5000 emails to Microsoft Consumer Inboxes using the same 5322.From address.

550 5.7.26

Returned when there is a misconfiguration in your SPF, DKIM or DMARC records.