Mailgun returns error 550 for some email domains. For example:
Error: 550 Deliver Unsuccessful due to DNS misconfiguration or absent MX record.
Other domains work fine even though TXT DNS is verified while MX records point to another provider.
I experienced a similar issue with Mailgun where specific domains caused the 550 error message. In my case, the root of the problem was an incomplete DNS configuration. Even though the TXT records were properly set for domain verification, the missing or improperly configured MX records resulted in Mailgun rejecting the email. After reviewing and updating the DNS settings to ensure that Mailgun recognized the email routing correctly, the errors stopped occurring. I recommend thoroughly checking each domain’s DNS entries to avoid this kind of delivery failure.
Based on my experience, the 550 error can sometimes be a result of partial DNS configuration rather than a full failure of the TXT record verification process. In one instance I encountered a similar error where the domain had correctly working TXT records; however, the MX records were either misconfigured or omitted entirely. After diving deeper, I made sure that each domain had complete and proper MX entries, which resolved the issue. This process emphasized the necessity of reviewing all DNS parameters, not just the verification records, to ensure proper Mailgun operation.
hey, i had similar issue once, and it turned out to be an overlooked mail routing record. even though txt was fine, the actual mail subdomain needed setup. doublecheck your complete dns details beyond just the verification parts!