[deleted] can you check that everything is green on your domain, especially the "domain verification & dns" part? Also if you don't have ssl on your domain set under "Security Settings For Outgoing Mail":
- tls to opportunistic
- Certificate Verification to not required
krakmh flarum (just like any other php application using packages) is only applying for a request to send e-mail. Whatever you configured is supposed to handle it. There are plenty of reasons why this is not working, but none of them relate to Flarum. Here are some pointers:
- Your server or hosting provider is firewalling outgoing data on the mail ports
- Mailgun is not configured properly
- Flarum is not configured properly
- Your dns records are not configured properly
- Your mail client or mailgun is marking your mail as spam
- The ip of your server is marked as a spam ip.