[Mimedefang] Is this to escape blacklist_from?

[Fred Felgenhauer]

I was parsing my logs trying to get a list of from addresses that are
spamming me.

Has anyone seen th ^M's tacked onto the from address?  Is this an attempt to
bypass blacklist_from?

Jun 15 05:08:28 mail mimedefang.pl[5266]:
MDLOG,h5F98OEs007503,spam,13.9,219.240.36.247,<d0vqbo50je at yahoo.com.hk^M>,<c
schang at mydomain.com>,Mortgage Rates down to Lowest since 1966!  aw