The following problem: I had some issues setting up SMTP for Digital Ocean. And also other hosters, since there seems to be a tendency towards “we will not allow SMTP traffic” for a good reason. Please also refer to this thread: Use Mailgun API, instead of SMTP for onboarding-emails? The idea here…

I notice you’re using a sandbox domain. MG doesn’t allow delivery to anywhere except the addresses registered with it if you’re using the sandbox. If you’ve got a mismatch between the addresses MG thinks are OK for the sandbox and the address you’re trying to sign up, that’s a problem. You probab…

Make onboarding emails also work via API (not only SMTP)

Developer help Self-hosting

Cathy_Sarisky March 28, 2025, 9:37pm 3

Vikas, the docs don’t show an example with Mailgun API, only SMTP. Might be a docs problem, though!

Transactional mail with Digital Ocean

Topic		Replies	Views
Use Mailgun API, instead of SMTP for onboarding-emails? Self-hosting	8	329	March 28, 2025
Emails not being sent from self-hosted Ghost instance Developer help	4	1261	January 27, 2021
Mailgun SMTP stopped working on Docker Developer help	5	39	January 22, 2026
Ghost Labs: Mailgun domain and API Memberships & subscriptions	6	2650	June 3, 2020
Transactional mail with Digital Ocean Self-hosting	4	274	May 12, 2025

Make onboarding emails also work via API (not only SMTP)

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