Hi, I have recently seen and had user reports that AOL are now rejecting ALL email from my organisation to AOL.
In terms of configuration we hold the MX records locally and treat O365 as a mail store and so all email to/from O365 goes via my local routing as a smart host.
I have manually confirmed that if I email AOL addresses from my local routing servers that email is accepted, this has also been verified with a local mail account that has no interaction with O365 in any way.
All email that originates from O365 to AOL fails.
Looking at the full mail headers of the examples that have been provided to me, the one thing in common that AOL could be picking up on seems to be:
The interesting part of this is the:
Received-SPF: softfail (mail103-am1: transitioning domain of canterbury.ac.uk does not designate 157.56.250.213 as permitted sender)
This comes from within O365/Fope somewhere, 157.56.250.213 is not in my address space and so I am never going to create a DNS SPF record for this, also the address does not appear to have a reverse PTR record.
I suspect though cannot be sure as I cannot get a response from AOL that the above may be causing the issues that I am seeing.
I am also curious to know why my domain is regarded as 'transitioning'.
Can anyone help me get this sorted out?
Thanks
Paul