Setting the global size limit of Postfix mail

Only one parameter and some basic math are required to set the size limit of an email message under Postfix.

To set the size limit of a message, edit /etc/postfix/main.cf and set message_size_limit=. The unit should be the number of bytes.

Now do some math: to allow sending a message of no more than 10MB, the number should be 1024*1024*10 bytes, which equals 10485760. Just fill this number to the other side of the equation.

Remember:

1KB = 1024Byte
1MB = 1024KB
10MB = 10240KB = 10*1024byte*1024byte

This is indeed confusing and I just showed how I suck at math. For detailed information, read this wikipage.

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