IronPort - advanced configuration guide

Chapter 1 Customizing Listeners
Loose Mode
Additional Options
OL-25137-01
The loose parser is basically the existing behavior from previous versions of AsyncOS. It does its
best to “find” an email address and:
– Ignores comments. It supports nested comments (anything found in parenthesis) and ignores
them.
– Does not require angle brackets around email addresses provided in “RCPT TO” and “MAIL
FROM” commands.
– Allows multiple nested angle brackets (it searches for the email address in the deepest nested
level).
In addition to the two parsing modes, you can specify behavior for the following additional items listed
in Table 1-3.
Table 1-3 SMTP Address Parsing Additional Options
Option Description Default
Allow 8-bit username If enabled, allow 8-bit characters in the username portion of the
address without escaping.
on
Allow 8-bit domain If enabled, allow 8-bit characters in the domain portion of the
address.
on
Cisco IronPort AsyncOS 7.6 for Email Advanced Configuration Guide
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