I am trying to use my shaw email account(IMAP) while using a 3rd party ISP.  The connection logs show the following error:

READ Jul 11 20:29:08.850 [kCFStreamSocketSecurityLevelNone] -- host:mail.shaw.ca -- port:587 -- socket:0x600001c6cc60 -- thread:0x6000021504c0
421 shw-obgw-4003a.ext.cloudfilter.net cmsmtp 209.52.140.xx blocked. AUP#DNS

Who do I contact to unblock the IP address being blocked