WSM User Guide - WatchGuard Technologies

Configuring the SMTP Proxyallow more functionality. ESMTP gives a method for functional extensions to SMTP, and for clients whosupport extended features to know each other.1 From the Categories section, select ESMTP Settings.Allow BDAT/CHUNKINGSelect to allow BDAT/CHUNKING. This enables large messages to be sent more easily throughSMTP connections.Allow ETRN (Remote Message Queue Starting)This is an extension to SMTP that allows an SMTP client and server to interact to start theexchange of message queues for a given host.Allow 8-Bit MIMESelect to allow 8-bit MIME, if the client and host give support to the extension. The 8-bit MIMEextension allows a client and host to exchange messages made up of text that has octets whichare not of the US-ASCII octet range (hex 00-7F, or 7-bit ASCII) that uses SMTP.Allow Binary MIMESelect to allow the Binary MIME extension, if the sender and receiver accept it. Binary MIMEprevents the overhead of base64 and quoted-printable encoding of binary objects sent thatuse the MIME message format with SMTP. We do not recommend you select this option as it canbe a security risk.Configuring authentication rulesThis ruleset allows a number of ESMTP authentication types. The default rule denies all other authenticationtypes. The RFC that tells about the SMTP authentication extension is RFC 2554.1 From the Categories section, select Authentication.2 Do the steps used to create rules. For more information, see “Defining Rules” on page 79.User Guide 169