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## MD5 hash of default main.cf filter, obtained with this command :
# grep -v -E "^(myhostname|mydestination|mailbox_command)" /etc/postfix/main.cf  | md5sum -
postfix_maincf_md5_jessie: "5450c05d65878e99dad696c7c722e511"
postfix_maincf_md5_stretch: "30022953f1f61f002bfb72e163ecb27e"