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Realtime Antivirus Installed - By default, EFS checks to see that the message file it has just received and written to the Inbox folder, actually exists. If it does not exist, it unmarks the file for deletion from the Pop server. If you have realtime antivirus software installed that detects a virus in an inbound .MSG file (and the anti-virus software is set to quarantine or delete the file) then when EFS checks the file for existance and sees it is not there, it will unmark the file from deletion causing the message to indefinately remain on the Pop server. Enabling the "Realtime Antivirus Installed" setting disables this verification check allowing the message file to be removed or quarantined by the antivirus and processing to continue.

Delay SMTP Sending to Allow Realtime Anti-virus Scanning - (Advanced Plus Version ONLY) causes EFS to delay the amount of time specified (dynamically adjusted depending on how many bytes were downloaded) in order to give realtime antivirus software time to scan the message files and remove them.

Remove 'Read Receipt' request from all Inbound Messages - (Advanced Plus Version ONLY) some mail servers/clients support 'Read Receipts' where a header value is added to the message of a sender requesting an automatic email response indicating that the recipient of the message has read it. This can cause annoying popup's to appear from the receivers mail client requesting a read receipt of the message. Any instance of 'Return-Receipt-To' or 'Disposition-Notification-To' headers are removed if this setting is enabled.

Allow Email with Incorrectly Formatted Email Addresses - enabling this option forces EFS to try and send a message anyway, even if the server rejects the email address as being bad because of a poorly formatted email address or similar. There are no guarantees your mail server will accept the message anyway so use with caution

Block Messages if Primary Domain exists in From Address - (Advanced Plus Version ONLY) Causes EFS to drop email messages if the domain name in the senders address is the same as the domain that EFS accepts mail for. This is often used by spammers to try and bypass spam filters. Use with caution if people outside your organisation have the same domain name as your local domain. Emails that have sender/recipient domains matching will cause EFS to log the message "domain match, moved to 'junk' folder"

Install/Uninstall EFS as a Windows Service - (Advanced Plus Version ONLY) Registers EFS as a 'Windows Service' so EFS can start automatically without requiring any user logon. For more information click here

Backup all Inbound Messages - (Advanced Plus Version ONLY) Will cause EFS to backup a copy of the Pop3 message to the folder specified before sending to the SMTP server. To tell EFS to create and store messages in subfolders by date, create a REG_SZ registry key called BackupFormat under HKEY_LOCAL_MACHINE\SOFTWARE\Chimera\Control that contains the format of the subfolders. For example, assume the date that EFS retrieves messages is 14th of November 2010, enabling this option and choosing "C:\EFSBackup" as the parent folder from the GUI, then adding a BackupFormat key to registry in the format:

Example 1. "yymmdd" would create backups in subfolder C:\EFSBackup\101114\
Example 2. "yyyy\\mmm" would create backups in the subfolder C:\EFSBackup\2010\Nov\
Example 3. "yyyy\\mmmm\\dd" would create backups in the subfolder C:\EFSBackup\10\November\14\

Note: You must use double back slashes if specifying more than one subfolder. You must restart EFS for changes to take effect if you make changes to this key in registry