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.

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Best practices

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Warm-up your domain

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

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Use a sub-domain for non-Support email sends

Use a subdomain (like marketing.atrium.co) for non-Support customer communication.

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Known errors

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550 DMARC check failed

Occurs if your SPF record has the -all strict flag.

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550 5.7.515

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

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550 5.7.26

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