Ensim Server accounts have Mailscanner installed by default.
If you get a email with the subject : [Blocked Content] Original email subject here
body like :
Warning: This message has had one or more attachments removed
Warning: (msg-xxxx-200.html).
Warning: Please read the "yoursite-Attachment-Warning.txt" attachment(s) for
more information.
and an attachment like :
This is a message from the MailScanner E-Mail Virus Protection Service
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The original e-mail message contained potentially dangerous content,
which has been removed for your safety.
The content is dangerous as it is often used to spread viruses or to gain
personal or confidential information from you, such as passwords or credit
card numbers.
If you wish to receive a copy of the original email, please
e-mail helpdesk and include the whole of this message
in your request. Alternatively, you can call them, with
the contents of this message to hand when you call.
At Date / Time the content filters said:
MailScanner: Found a script in HTML message
Note to Help Desk: Look on the yoursite MailScanner in /home/virtual/sitexxx/fst/var/spool/mail.quarantine/2009xxxx (message nAXXXXXXXXX30370).
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Postmaster
MailScanner thanks transtec Computers for their support
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It means that you had a email that triggered the mailscanner off. This email contains details of what to do if you want to retrieve the email, or you can ignore the email and the mail will be deleted.
We can turn mail scanner off on your site if you like and mail will be delivered unchecked to your accounts. Please open a support ticket if you would like that turned off.