dane.sys4.de: certificate not trusted: (27)

Dear DANE users,

Validating the SMTP DANE setup of, it results in success but the details show two untrusted certificates:

mx2.molgen.mpg.de (141.14.17.10) [1]:

3, 1, 2 7aad43a0fdff3445[...]49cd4a23db83374c - certificate not trusted: (27)

molgen.mpg.de (a1241.mx.srv.dfn.de, 194.95.232.62)

3, 0, 1 c613b846076b5503[...]539e7ac79a3f13e9 - certificate not trusted: (27)

It’d be great if you pointed me into the direction, how to get more details for these issues.

Kind regards,

Paul

[1]: https://dane.sys4.de/smtp/mx2.molgen.mpg.de [2]: https://dane.sys4.de/smtp/molgen.mpg.de