Hello Jorge, I found additional info from the Postfix folks:
message_size_limit = <bytes> (i.e. message_size_limit = 10000000 for 10 Meg) is for message size limits. mailbox_size_limit = <bytes> (i.e. mailbox_size_limit = 1000000000 for 1Gig) is for mailbox size limits. I do know if webmin will allow you to change these, so you may have to hand edit the "main.cf" file and add them. Don't forget to refresh Postfix after altering the configuration.
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