[AusNOG] Office 365 - 4.7.550 Access Denied

[Paul Foote]

Register with their "Smart Network Data Services" program to check your IP
blocks: http://postmaster.live.com/snds

On Mon, Nov 2, 2015 at 5:30 PM, Shane C <shanec-au at outlook.com> wrote:

> Hi All
>
> Anyone ever had any luck with dealing with Office 365 (Microsoft
> SmartScreen?) mail filtering issues?
>
> We're getting: 451 4.7.550 Access denied, please try again later. For
> more information please go to
> http://go.microsoft.com/fwlink/?LinkId=526653. (AS22) (in reply to RCPT
> TO command)
>
> Looks like it's related to the volume of email we're sending. But it's all
> legit email and our mail servers / DNS etc are clean and setup correctly.
> We've checked our IPs - not on any black lists, IP reputation with
> Barracuda, Fortigate etc all seems to be OK. Only having issues with mail
> to O365.
>
> Haven't had much luck with the normal support channels today.
>
> Shane
>
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>
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