I have a mailgun account, which I have setup MX records for in Cloudflare. There are still a few errors when sending out emails, mainly: “Sender address rejected: Malformed DNS server reply”.
I have been working with Mailgun support on this, and they have said the following:
It looks like we’re still showing similar values for your MX records:
dig mg.siteurl.com MX +short 10 mxb.mailgun.org\03210. 10 mxa.mailgun.org\03210.
Can you remove the trailing “\03210” from these? Your screenshot doesn’t seem to show them, so you may need to double-check this with Cloudflare.
When I look this up in Cloudflare, it does not show any trailing numbers.
Has anyone come across this issue in the past?