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SpIDer Mail scans email messages only if you are using a local mail client (for example, MS Outlook, Mozilla Thunderbird, etc.). Moreover, emails are scanned as they are downloaded. When the list of new messages is displayed on the server, they may not yet have been physically downloaded by you, and, thus, at that moment, they are still unscanned.
If an email is opened via a browser, it is not downloaded to the local computer. Instead, it is rendered by the browser according to the message located on the remote server. It is impossible to scan an email if it is not fully downloaded. But any attachments you save from an email message on the disk of your computer will be scanned by SpIDer Guard.
If the spam filter misrecognizes some letters, they can be forwarded to special mail addresses for analysis and improving filter performance quality:
Important! You should forward messages as attachment, not as inline.
You can test proper operability of anti-virus programs detecting viruses by their signatures with the use of EICAR (European Institute for Computer Anti-Virus Research) file.
This program is specially designed to allow you to see how the installed anti-virus will alert you to the viruses it detected, with no need to expose your PC to danger. Eicar program is not malicious but is specially tuned so that most anti-viruses treat it as a virus. Dr.Web refers to this “virus” as EICAR Test File (Not a Virus!).
To test mail anti-virus performance, you can ask a friend of yours to send you this file, or otherwise try to send it to yourself. If SpIDer Mail detects a virus — that is OK.