How to remove sender block in MS?

Question

Email

Good afternoon! We have corporate mail on the zoho service, it has been working for more than 5 years. Today, two employees do not deliver letters to some addresses (4 addresses), to other different addresses everything is ok. The email is returned with an error:

his message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.
rit**** INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.7.511 Access denied, banned sender[185.****]. To request removal from this list please forward this message to *** Email address removed for privacy reasons ***. For more information please go to go.microsoft.com/fwlink/?LinkId=526653. AS(508) [VE1EUR03FT017.eop-EUR03.prod.protection.outlook.com]
Received:from mail.zoho.eu by mx.zoho.eu with SMTP id 15496345318***; Fri, 8 Feb 2019 15:02:11 +0100 (CET) Message-ID:<168cd6a71f*****.com> Date:Fri, 08 Feb 2019 16:02:11 +0200 From:Info **** User-Agent:Zoho Mail To:"rit*****" Subject:test Content-Type:multipart/alternative;

Letter to *** Email address removed for privacy reasons *** - forwarded
here - go.microsoft.com/fwlink/?LinkId=526653 read that you can manually enter your mail, IP and unlock on a special page, sent a request from the site, an immediate response in the browser - a request to this address has already been received, please wait for processing, it can take up to 30 minutes. But the whole day has passed, the letters do not reach these addresses.
PS We don't have mailing lists as such, we communicate only with corporate clients.

Answer 1

"The best way to fight dandruff is the guillotine"

hotmail,outlook block / send to spam according to criteria known only to them alone. Paranoia is over the top, and you do not affect anything.
All these actions that they recommend to perform are like dead poultices
. Worse than that corporate mails are hosted on outlook
. Sorry, but there seems to be no way out.
Either ask the counterparty to create a mailbox on another hosting or send it yourself from there
PS
The answer assumes that spf / dkim, return to dns are configured correctly and you are not a spammer