undecipherable-files and amavis documentation

hi,

i modified the mailnotification for spam and virus in the amavisd.conf.

if i sent in my lab with centos7 a encrypted zipfile, amavisd changes the subject of the mail and sent the encrypted mail correctly to the recipient.

at the same time, amavisd sent the virus mailnotification to the virus-admin. but this is the wrong behavior because the mail is only encrypted and is not a virus.

is it a bug?

knows anyone the current documentation of amavisd?
were can i find officially information about the option like "undecipherable_subject_tag"?

i checked this site without success:


https://amavisd.de.postfix.org/amavisd-new-docs.html

https://www.ijs.si/software/amavisd/



thanks for any answers 


kind regards


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Mit freundlichen Grüßen

MMarzouki