When you attempt to send an email to a Symantec.cloud customer you may receive the following error message in a bounce back email.
clusterX.XX.messagelabs.com #<clusterX.XX.messagelabs.com #5.0.0 smtp; 553-mail rejected because your IP is in the PBL. See 553 http://www.spamhaus.org/pbl> #SMTP#
In the first instance you should use the Spamhaus IP lookup tool to confirm if your Sending IP is listed (https://www.spamhaus.org/lookup/)
If the lookup tool shows that your sending IP address is not listed on the PBL like so,
XX.XX.XX.XX is not listed in the PBL
and you continue to receive this problem it is still possible your IP address is listed on the PBL,
Symantec has become aware of a problem with the Spamhaus lookup tool where in if a subnet / range of IPs has been added to the Spamhaus Block lists instead of a single IP address, the search tool will not show you this information unless you search using the first usable IP address in your range.
How to find your IP range
Many popular DNS sites such as Mxtoolbox allow you to perform an IP WhoIs or a ARIN Lookup
Performing one of these checks on your sending IP address will return the range of external IPs that your sending IP belongs to
You can then recheck the Spamhaus lists using this IP address to see if the range is listed
XX.XX.XX.XX is listed in the PBL
With any valid entry on the PBL, Spamhaus with provide you with a PLCXXXXXX reference which you can click on to see more information about the listing and confirm that the sending IP in question is containted within the listing
The removal request can be followed as normal from here on out.
Ref: PBLXXXXXX
XX.XX.XX.XX/21 is listed on the Policy Block List (PBL)
Outbound Email Policy of The Spamhaus Project for this IP range:
This IP address range has been identified by Spamhaus as not meeting our policy for IP addresses permitted to deliver unauthenticated 'direct-to-mx' email to PBL users.
