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Email Security Quick-links: ESA Product Support | SMA Product Support | Email Submission and Tracking Portal | Cisco SecurityHub
Current General Deployment (GD) Releases:
ESA: 11.0.0-264 WSA: 10.5.1-296 SMA: 11.0.0-115 Email Plug-in (Reporting): 1.0.1-048 Email Plug-in (Encryption): 1.0.0-036

New Member

IronPort and Office 365

I'm in a bit of a dilemma with outbound mail with the Ironport and Office 365. Some domains do not receive emails from my organization when we send it through the ironport. If I turn off the outbound connected and let outgoing emails bypass the Ironport it works fine. I spoke with Microsoft support and they said it had to do with ESMTP and that I should disable or bypass that on the Ironport since Office 365 already does it. I cannot for the life of me figure out how to go about doing this in the Ironport and I couldn't really find anything about it in the manuals. Has anyone run into this situation or can anyone point me in the right direction so that I can resolve this? I really need to keep outbound mail flowing through the Ironport because we are required to send secured email attachments. Thanks.

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Cisco Employee

IronPort and Office 365

Hi Jerome,

Please call TAC and we will gladly assist you with this issue.

US Toll Free Customer Support +1 800 553 2447 Option #1