Very occassionaly senders to our e-mail domain get this message. Recently we have had it from GoogleMail.com and Yahoo.com. We calculate that 99.9998% of the rest of the mail gets through.
If I test our IP against
we get a completely clean bill of health.
Any ideas what I need to test next and if I need to contact Google or Yahoo how do I do so?
Many thanks as always.
p.s. I put this under Outlook as couldn't see in the new structure where to put an Internet e-mail delivery problem. This might need reclassifying.