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Sinch Mailgun ( https://www.mailgun.com/?utm_campaign=mg_onboarding_free&utm_medium=email&utm_source=cio )

Hi there,

Your Mailgun account is still missing a domain. A custom domain is required to send emails through our platform, build a reputation, and establish a professional identity with your emails so that your audiences are more likely to engage. Without one, you’ll have to utilize the sandbox domain to send only to authorized recipients.

Adding a domain can be done in minutes. Take a look at our documentation ( https://help.mailgun.com/hc/en-us/articles/203637190-How-can-I-add-or-delete-a-domai?utm_campaign=mg_onboarding_free&utm_medium=email&utm_source=cio ), and let us know if you have any questions.

Happy sending,
The Mailgun Team

Sinch Mailgun ( https://www.mailgun.com/?utm_campaign=mg_onboarding_free&utm_medium=email&utm_source=cio )

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2026 Sinch Mailgun ( https://www.mailgun.com/?utm_campaign=mg_onboarding_free&utm_medium=email&utm_source=cio )

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Accession

nse/mailgun/2026-09-23/2307

From

The Mailgun Team · updates@learn.mailgun.com

Sent

23 September 2026 · 19:00 UTC