Chrys, I did consult that same webpage, the AA official servers list. I emailed them last night to ask about SPF, but they haven’t got back to me yet, it is a weekend. That is the thing I don’t understand, what if ‘smtp.aa.net.uk’ is merely the correct overall thing for AA’s users to use to hand off outbound email to, but the names of the actual servers that do it, either the names that they self-identify with in transactions or the names that come up in PTR lookups could be different, names that identify individual servers within *.aa.net.uk? Can a PTR lookup return multiple answers?
I had published a maximally strict DMARC declaration and it was that that was causing the problem notification report to be triggered. I then removed the DMARC declaration for now, and re-sent the email, to see if it would now get through, although I wondered if it still might fail because of cached info. So you will not see any DMARC declaration at the moment, and won’t be able to look at the effects. Just in case you might be wondering where it had gone.
My wife has not reported any problems and she sends quite a lot of email.
Last February I had to move my email in a hurry, from my dearly-loved and much lamented UKServers Ltd, to AA, when UKServers got bought up by someone whom I had never heard of and was therefore not prepared to trust with a load of totally critical stuff. I anticipated there would be various problems due to my mistakes made in changing things over particularly as it was done in such a tearing hurry, and I certainly did get a few things very wrong at the time. Not having an include available to use in the SPF, I am now wondering if I have just been winging it, with no official pronouncement on how to do the guaranteed right thing. I did suggest to AA that they might want to officially document the correct SPF recipe, also suggested they even consider having a thing to automatically add various sorts of SPF declarations (optionally) for users who host DNS with AA and send their mail through them. This is something that UKServers had in their user-DNS setup thing, a button that you could just hit which would start you off with a DNS TXT SPF record. (How strict the declaration is depends on the user’s situation of course, and on whether they send email through other routes sometimes, as doing so would cause a problem.)