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Error migrating user from office 365 to on-premises

After migrating a user from on-premises exchange to O365 and try to move it back from O365 to On-premises the user will not move and you will see a message similar to the one below.

Resolution :


To resolve this issue, you will have to disable the ESMTP Inspection rule on your Cisco firewall.

The commands to disable ESMTP inspection are:

pix(config)#policy-map global_policy
pix(config-pmap)#class inspection_default
pix(config-pmap-c)#no inspect esmtp

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