Messages quarantined due to: Allow WebBugs = disarm

Carles Xavier Munyoz Baldó carles at
Thu Aug 1 17:45:48 UTC 2019

Since some days ago, I have had some e-mails don't delivered to my end users due to this error message:
MailScanner[14567]: Quarantined message x71GlTpg013562 as it caused MailScanner to crash several times

Investigating the problem I have discovered that it is caused by this configuration option:
# Do you want to allow <Img> tags with very small images in email messages?
# This is a bad idea as these are used as 'web bugs' to find out if a
# has been read. It is not dangerous, it is just used to make you give away
# information.
# Value: yes     => Allow these tags to be in the message
#        disarm  => Allow these tags, but stop these tags from working
#                   Note: Disarming can be defeated, it is not 100% safe!
# Note: You cannot block messages containing web bugs as their detection
#       is very vulnerable to false alarms.
# This can also be the filename of a ruleset.
Allow WebBugs = disarm

If I modify it for "Allow WebBugs = yes" then the problem dissapears.

But the strangeous thing is that this problem has arised suddenly, maybe after an OS (we are using Ubuntu 16) software update, but we are not sure.

Any one knows why?

Thank you very much for your great help!

Carles Xavier Munyoz Baldó
Departamento de I+D+I
Tel./Fax: 966 446 046
cmunyoz at

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