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<p>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.</p>
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<figure class="wp-block-image"><img src="https://lh4.googleusercontent.com/VnZLH7c1SzAfRalupb2dToTYB_jPnhB4kCkho2gnJa_ju7diJAX_sHkNpytQg3xCDWczRRY-Puo9u-mpvvbp9sGk019wz-p6qJJRuYyLORiFHc4rmfU=w472" alt=""/> 

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</figure>



<p><strong>Resolution :</strong></p>



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



<p>The commands to disable ESMTP inspection are:</p>



<p>pix(config)#<strong>policy-map global_policy</strong></p>
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<p>pix(config-pmap)#<strong>class inspection_default</strong></p>



<p>pix(config-pmap-c)#<strong>no inspect esmtp</strong></p>



<p>pix(config-pmap-c)#<strong>exit</strong></p>
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<p>pix(config-pmap)#<strong>exit</strong></p>

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