Alias_blocklimit and alias_linelimit alias options
alias_linelimit alias options may be used to limit the size of messages that may be posted to the address (whether user or group or list). The
value must be an integer number of MTA blocks for
alias_blocklimit, or an integer number of lines for
alias_linelimit. The number of bytes in a block is specified via the
block_size MTA option. By default, neither
alias_linelimit is set; being unset (or being set to a value of 0) means that they impose no limit on the size of message that may be posted to the address (though other limits, such as channel or system wide limits, may be in effect). In particular, neither
alias_linelimit will override more general limits that may be in effect; they are minimized with any such general limits.
For user, groups, and lists defined in LDAP, see
mailMsgMaxBlocks attribute (or more precisely, the attribute named by the
ldap_blocklimit MTA option).
The legacy configuration analogues are the [BLOCKLIMIT] and [LINELIMIT] alias file named parameters.