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Just transitioned from OLSB to 365 (domain and email support), finally, and thought I worked out all the kinks. It seems that now for some of my recipients my emails are rejecting. I was able to send emails to these folks utilizing my hotmail account no problem, but utilizing my exchange account, I get the following message and was hoping that someone could assist. Thanks!!
69-64-92-15.dedicated.abac.net rejected your message to the following e-mail addresses: