Bananas filled in an online form in html somewhere on the internet. Dmarc (my blog) and microsoft windows thought it was wrong as the ip did not match which is sort of technically correct however if a bit bonkers .
Received: from mail pickup service by x with Microsoft SMTPSVC;
Final-Recipient: rfc822; somebody
Diagnostic-Code: smtp;550-5.7.1 Unauthenticated email from bananas is not accepted due to
550-5.7.1 domain’s DMARC policy. Please contact administrator of bananas
550-5.7.1 domain if this was a legitimate mail. Please visit
550-5.7.1 https://support.google.com/mail/answer/2451690 to learn about DMARC
550 5.7.1 initiative
Wow Microsoft Windoze is really retarded
Um err well that is an interesting use of dns record. Needless to say the services [paid] where not utilised.
In the weird world of windows server, i will first ask for there company to provide me with an email account so i email the query via the web form to there email.
Later on i should have got a dmarc report in theory but none came. Oh well two years pass and this is the only weirdness i have encountered
Good to know* for next time. So if your smart enough to run a windows server and your reading this congratulate yourself