After recently upgrading to 7.1.4, I'm getting a new error log in /opt/zimbra/log/ called spamtrain.log, it is full of errored lines such as "BASE64Decoder: Error in encoded stream: needed at least 2 valid base64 characters, but only got 0 before padding character". I've got all the anti-spam/anti-virus turned off in 7.1.4 as far as I can tell, but it appears to be still trying to do the training. I don't want this behavior, the previous version before the upgrade (5.0.16), did not generate this log. Is there anyway to shut it off, it implies to me that it is still trying to scan messages somewhere.