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Outlook receiving old duplicate emails

Dear Team we have strange issue,

We have just deployed sophos XG firewall and also hosting in-house email server, our outlook users are receiving old readed emails as new duplicated unreaded emails after new firewall.

Anyone can help me out

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0 FormerMember over 3 years ago

Hi imran ahmed1,

Thank you for reaching out to the Community!

What is the firmware version on our firewall? Did you configure SMTP operation mode as MTA or Legacy? Would it be possible for you to share email protection configuration screenshot? You may obscure your email domain and IP address for discretion.

Thanks,
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0 imran ahmed1 over 3 years ago in reply to FormerMember

We didn't configured email protection and we using in legacy mode. Firmware is 18.05
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