У вас MTA courier. Я им никогда не пользовался, потому могу судить только по
ману:
Цитата:
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The Courier mail server uses several configuration files which are located in /etc/courier. These configuration files are plain text files that can be modified with any text editor. In certain instances a subdirectory is used, and all plain text files in the subdirectory are concatenated and are considered to be a single, consolidated, configuration file. Unless otherwise specified, you must run courier restart for any changes to these files to take effect.
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Во FreeBSD конфиги будут скорее всего в /usr/loca/etc/courier.
Цитата:
sizelimit
Maximum size of the message, in bytes, that the Courier mail server accepts for delivery. The Courier mail server rejects larger messages. If sizelimit is set to zero, The Courier mail server accepts as large message as available disk space permits. If the environment variable SIZELIMIT is set at the time a new message is received, it takes precedence and the Courier mail server uses the contents of the environment variable instead. Changes to this file take effect immediately. The SIZELIMIT environment variable is for use by individual mail submission agents. For example, it can be set by the smtpaccess configuration file (see makesmtpaccess(8) for more information) for mail from certain IP addresses.
If sizelimit does not exist, and SIZELIMIT is not set, the maximum message size defaults to 10485760 bytes.
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Т.е., насколько я понял, нужно либо изменить значение в /usr/loca/etc/courier/sizelimit, либо это же значение в переменной среды SIZELIMIT и перепустить курьер.
