The default for all
other delivery agents is 0. To change the default at the mc level select the appropriate
expression from the following two, for example:
define(`SMTP_MAILER_LL??, `4096??) ?†? smtp, esmtp, smtp8, dsmtp (V8.14 and later)
define(`RELAY_MAILER_LL??, `4096??) ?†? relay (V8.14 and later)
Note that prior to V8.14, you had to copy an existing delivery agent definition and modify
it as outlined in ?§20.3.2 on page 715.
20.5.8 M=
Maximum message size All versions
The M= delivery agent equate is used to limit the total size (header and body combined) of
messages handled by a delivery agent. The form for the M= delivery agent equate is:
M=nbytes
Here, nbytes is the ASCII representation of an integer that specifies the largest size in bytes
that can be transmitted. If nbytes is missing, or if the entire M= delivery agent equate is
missing, nbytes internally becomes zero. If the value is zero, the limit is set by the
MaxMessageSize option (?§24.9.68 on page 1047). If bothare zero or undeclared, no
checking is done for a maximum.
If the size of the message exceeds the limit specified, an error message is returned
(bounced) that looks like this:
----- Transcript of session follows -----
552 5.3.4
... Message is too large; nbytes bytes max
Bounced mail includes a copy of only the headers. The body is specifically not bounced,
even if RET=BODY is requested in the SMTP envelope.
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