Do I need to install other software in order to use any of the five anti-virus scanning engines supported by GFI MailEssentials? Author: Luis Fernandes November 30, 2018 04:40 AnswerNo. All the anti-virus scanning engines are embedded within GFI MailEssentials. No other software is required to be installed to scan your emails for viruses using GFI MailEssentials. Related articles Does the LDAP Directory Harvesting feature support using other LDAP fields?