![]() Checking to make sure you’re not hosting an open mail relay.Ensuring your SMTP banner hostname contains the FQDN of your mail server.SPF and DKIM records that indicate your IP is allowed to send mail from your domain.Your IT professional should be able to assist, but at a minimum, we recommend implementing and checking the following: We suggest the following steps to resolve the blacklisting: First stepsįirst, ensure that your on-premises email server is set up according to current best practices. Instead, it appears that Microsoft and its related services have implemented aggressive anti-spam measures, and either the messages or the configuration of your email server match some unknown set of criteria that have resulted in blacklisting from Microsoft. We can advise that - following numerous investigations - no Pentanet IPs appear on any known public blacklists or RBL lists. Please contact your Internet service provider since part of their network is on our block list (S3150). Unfortunately, messages from weren’t sent. If you’re receiving a bounce-back email from Hotmail/Outlook/Live with a message similar to the below: ![]()
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