[dns-operations] dnsviz.net complaining "UDP_-_NOEDNS_" for gtld-servers.net

[Viktor Dukhovni]

On Fri, Jun 05, 2020 at 11:26:55AM +0200, Thomas Mieslinger wrote:

> I have a customer complaining being unable to send/receive email.
> 
> https://dnsviz.net/d/sportsproducts.net/dnssec/

The report as stated does not contain sufficient detail.  What does
"unable" mean, especially in the context of a bidirectional issue.

No inbound email from particular senders?  From all senders?  What
do the senders see as the apparent problem?

No outbound email to particular receivers?  To all receivers?  What
do the MTA logs report as the apparent failure mode?

The domain looks fine for inbound mail.  DNS is OK:

    sportsproducts.net. IN DS ? ; NODATA AD=0

    sportsproducts.net. IN MX 10 mx00.1and1.com. ; NoError AD=0
    sportsproducts.net. IN MX 11 mx01.1and1.com. ; NoError AD=0

Opportunistic TLS is also OK:

    $ posttls-finger -l may -L summary -c sportsproducts.net
    posttls-finger: Untrusted TLS connection established to mx00.1and1.com[74.208.5.3]:25: TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)

-- 
    Viktor.