Experiencing auth problems using Mailgun with Nodemailer despite a correct API key. Sample code:
const mailModule = setupMailer({provider: 'Mailgun', credentials: {userId: 'apiUser', token: 'secretKey'}});
Works fine with Gmail.
I encountered similar issues when I initially set up Nodemailer with Mailgun. In my case, the problem was not only in the API key format but also with the SMTP configuration. Mailgun requires using a specific username (usually just ‘api’) along with its associated token, and it’s essential to configure the correct SMTP host and port. I discovered that formatting mistakes, like extra spaces or misconfiguration of the domain value, can cause auth failures. Double-checking each parameter in your configuration resolved the issue for me.
Based on my experience, the issue may also lie in the way the configuration parameters were set up for Mailgun. In my case, it turned out that the SMTP port and host settings needed careful attention. Ensuring the correct SMTP endpoint and confirming that the sender domain was properly verified in Mailgun helped resolve the problem. It was not just about the API key but also synchronizing the SMTP settings according to Mailgun’s documented requirements. Rethinking the overall configuration allowed me to authenticate without issues.
hey, double-check that your user is set to ‘api’ and not a mispelled variant. i had a similar issue due to a tiny typo in my host name. sometimes it’s the small errors in your env vars that trip things up!
Based on my own experience, once I initially struggled with Nodemailer and Mailgun integration as well. What ultimately helped was a thorough review of the Mailgun configuration in both the control panel and the Nodemailer setup. In my case, after confirming that the SMTP settings, especially the host and port, were correctly specified, I found that using the precise username, which should be exactly ‘api’, made all the difference. I also verified that the domain settings in Mailgun exactly matched the domain I was sending emails from. Such meticulous cross-checking typically resolves most authentication errors encountered.