Security gateway
Halon
Halon is a security gateway. Type any domain below to see if its email runs through Halon.
Provider profile
Halon
Halon is a security gateway. Its mail servers' hostnames end in .halon.io.
What is a security gateway?
A security gateway sits in front of the real mailbox to filter spam, phishing, and malware before mail reaches its destination. Inspection alone cannot tell you which mailbox provider sits behind it.
MX hostname patterns
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.halon.io
Other security gateways
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