Why does SMTP report negative size number?

When going into Message Settings/Message Settings/Restrictions and Controls…/Restrictions and changing the value of Maximum message size to 67011712, save and close, and then do a EHLO command the size reports back a negative number. Why is this? Is this a defect? This other versions of Domino and this issue exist in all of them. Below is what I got back when connecting to SMTP process and issuing a EHLO command and with the setting mentioned above.

ehlo test.com

250-w2003-a.hro.spt.symantec.com Hello test.com ([127.0.0.1]), pleased to meet you

250-HELP

250-SIZE -99483648

250 PIPELINING