Issue:
Incoming mail messages larger than 10,240,000 bytes (10MB) are bounced. Cannot find any setting in ISPConfig or main.cf.
Error message returned to sender:
"552 Message size exceeds fixed limit ..."
"551 Message size exceeds maximum limit ..."
Solution:
ISPConfig does not read/set the setting for individual or system-wide mail. The default setting is: message_size_limit = 102480000.
It may or may not be in the Postfix main.cf configuration file.
To add it, you can edit the main.cf file and add/update the entry. Or you can use the postconf command.
Examples:
To see the default setting:
# postconf -d | grep message_size_limit
message_size_limit = 10240000
To see the current / in use setting:
# postconf -n | grep message_size_limit
message_size_limit = 10240000
To see the current / in use setting:
# postconf -e 'message_size_limit = 50120000'
# postfix stop
# postfix start
# postconf -d | grep message_size_limit
message_size_limit = 50120000
Note:
The message_size_limit is a system wide setting.
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