Esvalabs Security Blog
Stay up to date with the latest findings for our Esvalabs
Cisco’s SpamCop service: worldwide outage after its domain expired
Yesterday most of the mail administrators, organizations, and MSPs worldwide suddenly found that their mail was being rejected as it reported as being listed in the blacklist at bl.spamcop.net. SpamCop, a wholly-owned subsidiary of Cisco Systems, provides a Real-time Blackhole List (RBL) that mail servers can use to determine if incoming mail should be marked as […]
Mimecast® for Microsoft 365™ hacked
A few days ago, Microsoft® informed that a Mimecast® for Microsoft 365™ certificate has been hacked and is being used against Mimecast’s customers. This certificate allows full administrative access to the Microsoft 365™ Exchange Web Services of some Mimecast’s customers, estimated to be around 10% of their global install base, who had configured the integration […]
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