IronPort - advanced configuration guide

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The following table lists valid entries in the masquerading table:
Left-hand Side (LHS) Right-hand Side (RHS)
username username@domain
Cisco IronPort AsyncOS 7.6 for Email Advanced Configuration Guide
Chapter 2 Configuring Routing and Delivery Features
This entry specifies a username to match. Incoming email messages matching a username on the
left-hand side are matched and rewritten with the address on the right-hand size. The right-hand side
must be a full address.
user@domain username@domain
The entry specifies an exact address to match. Incoming messages matching a full address on the
left-hand side are rewritten with the address listed on the right-hand side. The right-hand side must be
a full address.
@domain @domain
This entry specifies any address with the specified domain. The original domain on the left-hand side
is replaced with the domain in the right-hand side, leaving the username intact.
@.partialdomain @domain
This entry specifies any address with the specified domain. The original domain on the left-hand side
is replaced with the domain in the right-hand side, leaving the username intact.
ALL @domain
The ALL entry matches bare addresses and rewrites them with the address on the right-hand side. The
right-hand side must be a domain preceded by an “@”. This entry always has the lowest precedence
regardless of its location in the table.
Note You can use the ALL entry for private listeners only.
Rules are matched by the order in which they appear in the masquerading table.
Addresses in the From:, To:, and CC: fields in the headers are matched and rewritten upon receiving
by default. You can also configure the option to match and rewrite the Envelope Sender. Enable and
disable the Envelope Sender and which headers to rewrite using the config subcommand.
You can comment out lines in the table using a number symbol (#) at the beginning of each line.
Everything following a # to the end of the line will be considered a comment and ignored.
A masquerading table is limited to 400,000 entries, whether you create them via the new
subcommand or import them from a file.
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