
MailShield does not automatically introduce any limitation of received email size, unless specifically configured in the Content Filtering engine.
The chances for being blocked by remote (receiving) email servers from this reason are very low, since the majority of the servers will do one of these tests: 1. Will try to resolve the domain of the sender (as appears in the ""From:"" field) to an IP address, by looking for the MX record. Since the domain is necessarily resolveable (The MX points to MailShield servers), the test will pass. 2. Will try to reverse-lookup the sending server's IP to a valid domain name. As long as the suctomer's sender address is resolveable (customer's responsibility), there will not be any problem. Comparing the sender's address (outgoing server) to the sender's domain MX record (incoming server) is rarely done. Doing so will affect many ISPs like Google, Netvision etc. and is not a uniqe problemaic issue for MailShield
Virus Quarantined items: 14 days Spam / Content quarantine items: 30 days
We make daily backups of complete configuration, when a domain/user is removed, all it's settings, stats and quarantined items are removed. Keeping copies of all this would have a large inpact on resources. When a user is removed or a domain is removed, it can easily be re-created using the web interface.
Yes it can handle the common archive file types, like zip, rar, tar, bz
it will be blocked by the anti-virus filter, as it extracts these files to see what's in it
No, the content filter does not extract
It looks at the content/type in the e-mail (header)
It tests all files
Anti-virus commercial every 5 minutes, spamfilter is our own technology which is updated when it sees new technologies/signatures being used, on average once every 3-4 minutes