HP-UX Mailing Services Administrator's Guide (B2355-91064)

overflow attacks. The default setting for this option is unlimited, as shown in the

following example:

#O MaxMimeHeaderLength=0/0

DeadLetterDrop

Use this option to specify the location of the system-wide dead.letter file, which

was formerly hardcoded to/var/tmp/dead.letter. The default setting for this

option in this version is:

O DeadLetterDrop=/var/tmp/dead.letter

Sendmail does not save mail anywhere if this option is not set.

Socket Maps

Sendmail contains socket map to query the maps through the TCP/IP sockets.

The socket map uses a simple request or reply protocol over TCP or the UNIX domain

sockets to query an external server, which can be a third party or a self-coded program.

Neither the requests nor the replies end with a carriage return (CR) or line feed (LF).

Both the requests and the replies are text-based and are encoded as net strings. A string

"hello there" is represented as follows:

11:hello there

The request consists of the database map name and the lookup key, separated by a

space character, as follows:

The server responds with the following status indicator and the result (if any):

The status indicator is one of the following upper case words:

Specifies that the key is found and the result contains the looked-up

value.

NOTFOUND

Specifies that the key is not found and the result is empty.

TEMP

Specifies that a temporary failure occurred.

TIMEOUT

Specifies that a timeout occurred on the server side.

PERM

Specifies that a permanent failure occurred.

If the status is TEMP, TIMEOUT, or PERM, the result field contains an explanatory error

message.

Following are examples of the error messages in the result field:

Modifying the Default Sendmail Configuration File 49