Microsoft has a very well known spam problem right now. If you have a
support contact for Office 365, please make sure to use that as well to
complain. They desperately need to hear from their customers that
sharing IPs with spammers, who appear (at least from our perspective) to
operate with impunity, is unacceptable for a paid service. Right now
they're #4 on here: https://www.spamhaus.org/statistics/networks/
(though that may include their cloud IPs as well). We actually receive
more spam from Hotmail/O365 IPs than ham these days, which is not at all
historically normal for them.
On 2024-02-15 01:32, Christopher Hawker via mailop wrote:
Hello all,
I am attempting to send mail from a M365 tenancy, however, we are
seeing issues with it being filtered due to the address appearing on
bl.spamcop.net.
_"Decision Engine classified the mail item was rejected because of
IP Block (from outbound normal IP pools) -> 550 mail from
40.107.107.97 refused, see http://www.spamcop.net - Your mail
provider is blocked because is sending SPAM."_
If there is anyone on-list from Microsoft, could you please take a
look? It's causing issues 🙁
Thanks,
Christopher Hawker
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