mailbookproxy.dll is a dynamically linked library. In simple phrase, it is an essential component of a particular parasite. Most threats depend on such libraries and wouldn't work without them. The mailbookproxy.dll file can be responsible for the dangerous payload a parasite carries, so deleting it will definitely reduce all the security and privacy risks.
The mailbookproxy.dll file is installed and used by adware AdvSearch and ActualNames.
You are highly advised to scan the system, delete the mailbookproxy.dll file and all related objects.
Sometimes a presence of mailbookproxy.dll does not indicate that your computer is infected. It can be an essential system file or a file installed by harmless legitimate software and therefore may not pose any threat to your privacy and the system. Although such cases are quite rare, you should thoroughly examine mailbookproxy.dll before completely deleting or leaving it in the system.
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