My predecessor migrated our company over to Office 365 6 months ago. Everything has been working fine until last week. Before Christmas we made the required changes to MX record changes to our DNS as provided by Microsoft in time for changes to come into force by January 13th 2013. Now some of our emails are being rejected by recipient mail servers. Everything seems to point to a problem with these recipients not allowing mail from Bigfish or other Microsoft servers. Any ideas? In particular this seems to be a big problem when sending mail to any .AE domain.
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