Every email service provider has to deal with this from time to time, but well-designed email operations and infrastructure should generally limit the impact to a small subset of customers - usually, especially with a known high-volume sender, Spamhaus will list as narrow of a range as possible to prevent false positives.
The fact that this applies so broadly implies that Intercom may need to rethink some of the details of their email operations, and/or beef up their anti-spam enforcement efforts.
As an aside, it appears Intercom uses Mailgun with dedicated IPs, judging from recent samples.
The fact that this applies so broadly implies that Intercom may need to rethink some of the details of their email operations, and/or beef up their anti-spam enforcement efforts.
As an aside, it appears Intercom uses Mailgun with dedicated IPs, judging from recent samples.