Maximum allowed message size for S/MIM

[signin@pcs-ag.de]

Hello

 Asyncos Version: 16.0.3-044

we get an message:
"(DCID 327372) Message 16998928 to info@xxxxx.de bounced by destination server. Reason: 5.x.0 - Message bounced by administrator (This message is larger than the maximum allowed message size for S/MIME processing.) ('000', [])"

Is there a message size limit (5MB) by handling S/MIME mails or is this a message from the remote smtp server?
Full Stack:

Message 16998928 Sender Domain: yyyyyyyy.de
Start message 16998928 on incoming connection (ICID 25228429).
Message 16998928 enqueued on incoming connection (ICID 25228429) from Admin@yyyyyyyy.de.
Message 16998928 direction: outgoing
Message 16998928 on incoming connection (ICID 25228429) added recipient (info@xxxxxxxxx.de).
Message 16998928 contains message ID header '<70818b46175447b19730a5001268914c@yyyyyyyy.de>'.
Message 16998928 original subject on injection: Test Mail
Message 16998928 (22157681 bytes) from Admin@yyyyyyyy.de ready.
Message 16998928 has sender_group: RELAYLIST, sender_ip: 10.51.0.40 and sbrs: None
Message 16998928 matched per-recipient policy DEFAULT for outbound mail policies.
Message 16998928 aborted: Bounced by SIM_m94
(DCID 327372) Message 16998928 to info@xxxxxxxxx.de bounced by destination server. Reason: 5.x.0 - Message bounced by administrator (This message is larger than the maximum allowed message size for S/MIME processing.) ('000', [])

[Dustin Anderson · Accepted solution]

Assuming this is outbound, it was bounced by the destination server. Not much you can do about it.

Message 16998928 to info@xxxxxxxxx.de bounced by destination server. Reason: 5.x.0 

[signin@pcs-ag.de]

Sorry but "...it was bounced by the destination server..." is wrong.
We have tested with an different destination server (no limits) and we get the same message. So it comes the cisco email security self. Also no connection/conversation to the destination server will be found in the "SMTP Conversation Log". 
Where is the Limit inside the Cisco email security S/MINE Outgoing set or how can we changed ist?