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Graymail refers to solicited bulk email messages that are not spam. IMSS detects marketing messages and newsletters and social network notifications as graymail. IMSS identifies graymail messages in two ways:
  • Email Reputation Services scoring the source IP address
  • Trend Micro Antispam Engine identifying message content
Note
Note
Note that while IMSS detects these kinds of email messages, these messages are not tagged as spam.
Administrators define the rule criteria to take an action on those email messages. Every graymail message rule has an exception list containing address objects that bypass message filtering. An address object is a single IP address or address range (IPv4 or IPv6), or the Classless Inter-Domain Routing (CIDR) block.
Administrators have several options to understand graymail message traffic in the network. Reports illustrate the highest senders and recipients of graymail messages from external or internal sources. Administrators can also query detailed log information or view the email quarantine and release messages identified as permitted graymail messages when necessary.
The graymail exception list can be exported and imported.
Note
Note
Ensure that IMSS can query external DNS servers for graymail scanning. If you change any DNS server settings, restart the scanner server to load the new settings.