DNS problem: NXDOMAIN looking up MX

I am using https://mojzis.com/software/letsencryptshell/ client. Mainly because I want to be able to use DNS verification.

And when I try to register my email address I get the following message:

‘detail’: ‘DNS problem: NXDOMAIN looking up MX for throughputfocus.com}’, ‘type’: ‘urn:acme:error:invalidEmail’

Does anyone know what it takes to convince LetsEncrypt that my email address is valid?

When I have a look I get this:

dig +short MX throughputfocus.com
20 in2-smtp.messagingengine.com.
10 in1-smtp.messagingengine.com.

And we can see from the spf record that the messagingengine.com mail servers are permitted to send email on behalf of my domain.

dig +short TXT throughputfocus.com
"v=spf1 include:spf.messagingengine.com ?all"

Last time I checked, '}' wasn't a valid character for domain names.


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