Hi Team,

Does anyone have experience with subdomains being rejected by 
extmail.bigpond.com?  We have having problem with emails from subdomains hosted 
at O365 being rejected by bigpond.com.

e.g.
- mail from @somedomain.org.au is OK
- mail from @sub1.somedomain.org.au during mail from results in 550 5.7.1 
em...@sub1.somedomain.org.au<mailto:em...@sub1.somedomain.org.au> Sender domain 
rejected. IB302
- mail from @sub2.somedomain.org.au is accepted during mail from

It seems to me that sub1.somedomain.org.au is specifically blacklisted.  It is 
not listed any known RBL though accordingly to mxtoolbox.com or senderbase.  I 
see no way to getting a domain delisted in Bigpond.

Any help is much appreciated.

Thanks and Regards

John
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