Smitro
Why does my weekly virus scan pick up 8 viruses. All are in users junk mail folders.
There was about 3 different types. Are they not being scanned when they came in?
Read the headers of those messages to see why they were moved to the junkmail folder, then you will start understanding why.
Virus definition databases are not stagnent, they are being added to & updated externally all the time as new viruses or variants are released. It takes time for this process to happen, typically a day or two. Your server updates the virus definition database daily, so when a new virus is released & starts circulating the world you can receive infected email messages BEFORE the virus definition is updated with knowledge of the new virus. Therefore when your incoming emails are scanned, no virus is being found. A few days later when the new virus is now added to the virus definitions & your server now knows about it, and when a weekly system virus scan is done, infected email messages are found.
Probably the reason those email messages are in the junkmail folder, is because the spam filter has indentified them as having suspicious content, scored them appropriately, & moved them to the junkmail folder.
This is why GOOD virus protection is a multi layered approach, & updated & correctly functioning virus scanners on workstations are still an important part of virus protection. If the virus gets through one layer then there is another layer, or two or three layers, that the virus still has to get past & avoid being detected.
If viruses come from bad web sites or URL links, and your workstations DO NOT use sme server as their gateway (eg with Dansguardian installed), then you still need active & functional protection on each workstation, ie each gateway needs its own protection or layers of protection.