Gateway mode FortiMail - Messages Bounced Without further info

[rsamqui]

I'm having some troble getting some messages over the size of 10MB on my server. I've changed the max message size on the domain, session profile and content profile to 34MB. However, every time that I tried to receive a test email over 10MB on size, the message bounces without any further information and I have no related logs on my Fortimail.

Messages under 10MB are received and logged correctly on the monitor secition, I also tried to configure the max message size on the system GUI and through CLI but the GUI option is nowhere to be seen and the "set max-message-size" command is not being recognized either.

[AEK]

If you have no related logs on FML then I'm pretty certain the mail is not reaching FortiMail at all.