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I've created a mail server with https://github.com/tomav/docker-mailserver. Everything works, except the certificate.
I have tested the TLS on CheckTLS.com and I've got the following output messages:

enter image description here

As you can see on the image, it says, that Cert Hostname DOES NOT VERIFY (dataxu.io != email.dataxu.io | DNS:email.dataxu.io), do I miss any DNS entry?

The DNS records are setting up as follows:

enter image description here

zero_coding
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1 Answers1

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The error is pretty clear, but you aren't able to interpret it correctly:

Cert Hostname DOES NOT VERIFY (dataxu.io != email.dataxu.io | DNS:email.dataxu.io)

Here:

  • dataxu.io is the hostname on the certificate
  • != it's not equal to...
  • email.dataxu.io, your SMTP banner (on 220-email.dataxu.io message)
  • DNS:email.dataxu.io is the DNS name from your MX 10 email.dataxu.io.

You need to either replace the certificate with a certificate for email.dataxu.io or change your SMTP banner (& DNS MX hostname) to dataxu.io.

Esa Jokinen
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