I'm sorry to say, but this didn't just happen today - the att server has been blocking hsphere.biz mail server since this Monday - if you need to see a screen capture, please tell me where to email it. I don't want to post it here since it has my email address.
Regards,
emirgal --
Someone is using our mail server to send spam mass mailings.
In addition, my email address is blocked from *.att.net:
###@insightBB.com>:
Connected to 63.240.76.150 but sender was rejected.
Remote host said: 550-204.14.107.211 blocked by blacklist.sequoia.ops.asp.att.net 550 Blocked for...