You should look into the message content to make sure that it isn't
including any links to phishing web sites, web sites that are known
to distribute malicious software, MLM/pyramid-scheme affiliate links,
etc. There are certain subject lines that can get people into
trouble as well, and then there are compliance issues with sending
out bulk messages that should to be included in the SMTP headers.
Also, you should check all of your eMail server IP addresses (IPv4
and IPv6) for inclusion in blacklists:
https://multirbl.valli.org/
In the meantime, rate-limiting outbound eMails for your clients will
also help. Do you have a rough estimate of the total number of
recipients? Also, were the messages sent separate to each recipient,
or were multiple recipients grouped together?
> Hi,
> yesterday due to a user sending a newsletter to a list recipients full of
> errors (I'm sure about this, I don't know what the message text was)
> Microsoft started to "temporarily" rate limiting my 2 sending IPs.
>
> The messages are refused with the following log:
> 451 4.7.650 The mail server [.....] has been temporarily rate limited due
> to IP reputation. For e-mail delivery information, see
> https://aka.ms/postmaster (S775) [Name=Protocol Filter Agent][AGT=PFA]
>
> I registered to SNDS and found that these IPs turned red yesterday. I
> opened a ticket and the first automatic reply was that the IPs "do not
> qualify for mitigation".
>
> As requested, I then replied with a detailed email trying to explain the
> situation but reading previous posts it seems that they won't follow up.
>
> So I ask you:
> - did you have a S775 block in the past and how long was it ?
> - will I ever receive an answer from MS or my only possibility is checking
> the logs ?
>
> I have a brand new server with another public IP that is part of our AS and
> listed in SPF. I may route traffic to hotmail via this server but the IP is
> "cold". I read that someone solved this way but it was not clear if the new
> Ip was already warmed.
>
> Thank you
>
--
Postmaster - [email protected]
Randolf Richardson, CNA - [email protected]
Inter-Corporate Computer & Network Services, Inc.
Vancouver, Beautiful British Columbia, Canada
https://www.inter-corporate.com/
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