backup exec 2012 notification in spam filer

hi guys me again,

a new issue to my collection : /

i've configured BE2012 to send SMTP notifications - but all mail notifications are not getting through our SPAM filter.

found in the SMTP log from Exchange:

MAIL FROM:<Administrator@test.com> SIZE=95514 AUTH=<>

i think that might cause the issue:

 SIZE=95514 AUTH=<>

is there an option how to disable it ?

thank you in advance