Watchguard V10 User Manual page 305

General tab
This tab allows you to specify general values for incoming
SMTP content filtering.
Maximum Recipients
Firebox Vclass User Guide
proxy will filter all content of the specified type,
regardless of the port used.
Specifies the maximum number of email recipients
to which a message can be sent. This acts as a
counter, and allows the specified number of
messages through, then drops the remaining
addresses. For example, if the default setting of 50
is used, and a message is addressed to 52
recipients, the first 50 addressees receive the email
message, and the last two addressees are dropped.
Distribution lists that appear as a single SMTP
email address (for example,
Proxy Parameters Reference
273