I'm facing an issue with Mailgun when trying to send emails to certain domains. The error message I'm getting is:
550 Requested action not taken: mailbox unavailable invalid DNS MX or A/AAAA resource record
This happens specifically with domains like web.de. Interestingly, I can send emails to these domains from my personal Gmail account without any problems. Also, Mailgun works fine for other domains.
My DNS setup seems correct:
- Mailgun shows my domain is verified using TXT records
- MX records are set up for a different email provider I use for receiving emails
Has anyone encountered this before? Any ideas on how to fix it? I'm puzzled as it only affects some domains and not others.
I’ve dealt with this exact issue before, and it can be frustrating. In my case, the problem was related to the reputation of the IP address Mailgun was using for my account. Some domains, like web.de, are notoriously strict with their spam filters.
What worked for me was switching to a dedicated IP address with Mailgun. It costs a bit extra, but it gave me more control over my sending reputation. I also implemented a ‘warm-up’ strategy, gradually increasing the volume of emails sent to these problematic domains over a few weeks.
Another thing to check is your email authentication. Make sure your DKIM signature is correctly set up in addition to SPF. Some domains are really picky about this.
If all else fails, you might want to consider using a different ESP for these specific domains. It’s not ideal, but sometimes it’s the most practical solution.
hey there, ive seen this before. its usually a problem with the receiving domain’s spam filters. they might be blocking mailgun IPs. you could try using a dedicated IP or warming up your sending reputation gradually. also, double-check your SPF and DKIM records. good luck!
I’ve encountered similar issues with Mailgun before. One thing to consider is the possibility of your messages being caught in spam filters due to content or header issues. Have you reviewed your email content and headers for potential red flags? Additionally, it might be worth reaching out to Mailgun support directly. They often have insights into domain-specific delivery problems and can provide tailored advice. In my experience, they’ve been quite helpful in resolving these types of issues. Lastly, consider implementing DMARC if you haven’t already. It can significantly improve your email deliverability across various domains.