how to increase the mail attachment size in the Mailscanner

Dear Sir/Madam:

I have redhat enterprise linux as an mailserver , POSTFIX is a MTA , installed the Mailscanner i am in need to increase the attachment size of the mails
commented the attachment size in the MailScanner.conf still mail gets bounced saying size attachment size exceeded please help me how to increase the attachment size .
Thanks in advance.
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have you increased the option in message_size_limit

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D_wathiAuthor Commented:
i do not see te message_size_limit in the file of the postfix , is it required to add this line ,if yes
to allow 25MB attachment what is the syntax please help me
D_wathiAuthor Commented:
added the
 message_size_limit = 25000000
now the message goes from the outbox of the email client software but still the message is not delivered to the destination mail account.

i have set the mailscanner spam scan size to 25MB but how to set the attachment size of the postfix to the 25mb ,please help

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