I have started having issues with Telstra's senderscore to low. This not only affects clients sending to bigpond, but any domain hosted on bigpond or by telstra.
It seems telstra has taken it upon themsleves to censor evry one's email.
I have checked my server for leaks, compromises, viruses, hacks and can find nothing. All SPF, DKIM and DMARC records are valid.
How are clients to get email through to bigpond users?
Hello