Greenby email catch all setting?

[#1]

In theory yes. They would need to use different selectors and DKIM records for the Greenby keys and keys/selectors would need adding to the Plusnet DNS.

I suspect that the problem is that the Greenby system is setup to generate DKIM keys at the account (subdomain in this case)  level and that would mean DKIM key records being added to every subdomain!

[#2]

If so, then another gotcha as whilst the official outgoing server is plusnet relay server which presumably does pass dkim not everyone can use that

Also, trying to understand dmarc=pass result in earlier post.

[#3]

dmarc=pass occurs if either spf=pass or dkim=pass are present.

[#4]

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@MisterW wrote:

I suspect that the problem is that the Greenby system is setup to generate DKIM keys at the account (subdomain in this case)  level and that would mean DKIM key records being added to every subdomain!

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Oh dear! This sounds as if it may perhaps be a possible issue that occurred to me a while ago: The nature of Plusnet's email address system, based as it is on a sub domain name containing the username, means there are as many Plusnet email 'domains' as there are email users. (Hope I'm wrong).

[#5]

I can see in the header in post 10
header.from has spf=none and smtp.mailfrom spf=pass

So does dmarc only use the latter and why did one pass and the other result in none as assume in this example both are the same email address?