Severity: important

We have many Gmail users who are getting unsubscribed because Gmail
generates bounces on mail with illegal attachements (.exe, or archive
containing executables, and similar):

    SMTP error from remote mail server after end of data:
    host [2a00:1450:400c:c04::1b]:
    552-5.7.0 This message was blocked because its content presents a potential
    552-5.7.0 security issue. Please visit
    552-5.7.0 to review our
    552 5.7.0 message content and attachment content guidelines. 
je8si13362513wjb.36 - gsmtp

Unfortunately, the BTS is very laxist and will happily forwards such kind of 
So we should probably not count such bounces in the auto-unsubscription code.

On busy packages with enough legit mails, this is not a problem, but on
packages who are getting only spam (like "less" recently), this is a real

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (500, 
'oldstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

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