Subject: Re: [44net] Bad MX records in the ampr.org DNS From: John Ronan jpronans@gmail.com Date: 05/25/2015 11:00 AM

To: AMPRNet working group 44net@hamradio.ucsd.edu

On 25/05/15 09:52, Rob Janssen wrote:

...

linux.ei2edb.ampr.org/MX 'ei2edb.ampr.org' has no address records (A or AAAA) os2.ei2edb.ampr.org/MX 'ei2edb.ampr.org' has no address records (A or AAAA) ei7gm.ampr.org/MX 'bbs.ei7gm.ampr.org' is a CNAME (illegal) ei7gm.ampr.org/MX 'dubbbs.ei7gm.ampr.org' has no address records (A or AAAA) 486.ei9fk.ampr.org/MX 'ei9fk.ampr.org' has no address records (A or AAAA)

Delete them,

They are all ancient DNA.

Regards John EI7IG

After consulting Brian I have deleted all MX records that point to names for which no address record exists, including 4 of the above. 867 records in total.

Looking at CNAME and dotted address in MX records will be the next step. Note that an MX record must have a hostname that in turn has A and/or AAAA records. So MX records that contain e.g. "44.0.0.1" are not allowed. Neither are MX records that have a name that in turn is a CNAME pointer.

Most mail software will probably handle those bad MX records, so I have not yet deleted them. I advise those that make use of their MX records to fix them (replace the IP address with a hostname that resolves to that address, and replace a name that refers to a CNAME with the name that the CNAME points to).

Then I can check things again in some time.

Rob