When sending mail from the domain riconlalo.com (hosted by Google/Gsuite/Gmail), it is being rejected by Shaw.
Here is the error:
Google tried to deliver your message, but it was rejected by the server for the recipient domain shaw.ca by shw-central.mx.a.cloudfilter.net. [18.104.22.168]. The error that the other server returned was: 552 5.2.0 sender rejected AUP#SNDR
Can you please help us solve this, we need to receive mail from riconlalo.com.
Thanks in advance,