Product manual

GFI MailEssentials 7 Anti-Spam | 119
By default, Use authorized IPaddresses from perimeter server and Do not block authenticated
connections are enabled. It is not recommended that these options are disabled.
NOTE
Do not block authenticated connections check boxdoes not apply for Microsoft IIS and
Microsoft Exchange 2003. It only works with Exchange 2007 or later.
7.1.9 Greylist
The Greylist filter temporarily blocks incoming emails received from unknown senders. Legitimate
mail systems typically try to send the email after a few minutes; spammers simply ignore such error
messages. If an email is received again after a predefined period, Greylist will:
Store the details of the sender in a database so that when the sender sends another email, the
email will not be greylisted
Receive the email and proceed with anti-spam scanning
Greylist is NOT enabled by default.
Important Notes
1. To enable Greylist, GFI MailEssentials must be installed on the perimeter SMTP
server. For more information refer to http://go.gfi.com/?pageid=ME_GreylistSMTP
2. Greylist contains exclusion lists so that specific email addresses, domains and IP
addresses are not greylisted. Exclusions must be configured when:
Emails originating from particular email addresses, domains or IP addresses cannot
be delayed
Emails addressed to a particular local user cannot be delayed
Configuring Greylist
1. Go to Anti-Spam > Anti-Spam Filters > Greylist.
2. From the General tab select/unselect Enable Greylist to enable/disable Greylist.