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Disabling grey listing is imho your only option. |
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Thank you I did it and will let you know the result. |
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Or you can whitelist microsoft IPs using postwhite (already installed). |
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On my modoboba server we experience serious delays when the sender comes from office 365 or exchange server.
The sender is usually ....onmicrosoft.com and mails are delayed 3-4 or even 8 hours.
The sender usually didn't get any response and the mails are delivered but this delay is unacceptable for my client.
What can I do?
Any suggestion?
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