Office365 blocking mails from cloudv.spamtitan.com / 184.108.40.206
For those SpamTitan Cloud customers using cloud11/cloud12.spamtitan.com as their MX record, Office365/SpamHaus.org were blocking emails from cloudv.spamtitan.com (220.127.116.11) between about 12:30 AM GMT and 2:30 PM GMT.
4 Mar, 2023: 14:45 GMT/09:45 ET US
We submitted the delist, and it was immediately accepted:
DNS/MXtoolbox.com shows the IP address removed from SpamHaus (SpamHaus/cloudv.spamtitan.com check)
Office365 was still blocking , and referencing spamhaus at this time. We have already configured cloudv.spamtitan.com to not accept any mail, so it will flow though cloudw/cloudx.spamtitan.com (which are not blocked)
04 Mar, 2023 15:45 GMT/10:45 ET US
We confirmed Office365 and SpamHaus was not blocking anymore, and had already opened up SMTP Port 25 to cloudv.spamtitan.com.
You may see rejected/bounced emails as:
1) Delivery Status = Bounced, or
2) Invalid Recipient (If using Dynamic Recipient Verification, Office365 was rejecting the RCPT TO probes).