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The Email Security Gateway (ESG) services has a number of layers and engines to determine if inbound mail is SPAM, contains a virus/ malware or other suspicious attachments or is part of a phishing campaign.
Each of the engines performs a different function and an email is allowed, denied or the subject modified according to these process outcomes.
The following diagram outlines the decision tree and data flow associated with each of the engines and how an email may or may not be quarantined by the ESG.
When an email flows through the decision tree email subjects will be prefixed with an attack type (or engine outcome). For example, if someone sends an email with the subject "50% off website SEO" that is determined to possibly be spam the subject will read "[SISSESG: Probable spam email] 50% off website SEO"
To provide our uses with the applicable policy and associated text, please refer to the following tables.
Anti-Spam
Email type |
Additional Text to Subject |
Result |
Spam detected |
[SISSESG: Spam] |
Delete email and backup |
Probable spam |
[SISSESG: Probable spam email] |
Allow through |
Sender Blacklisted |
[SISSESG: WARNING - Sender is Blacklisted in RBL] |
Allow through |
Mass mailing |
[SISSESG: MASSMAIL] |
Allow through |
Anti-Virus
Email type |
Additional Text to Subject |
Result |
Scan Errors |
[SISSESG: scanning error - contact administrator if this message is required] |
Delete email and backup |
Encrypted object |
[SISSESG: Encrypted attachment] |
Attachment Deleted |
Infected Email |
[SISSESG: Infected] |
Attachment Deleted |
Disinfect Email |
[SISSESG: Cured] |
Attachment Deleted |
Macro Detected |
[SISSESG: Attachments with Macros] |
Attachment Deleted |
Anti-Phishing
Email type |
Additional Text to Subject |
Result |
Phishing |
[SISSESG: Phishing] |
Delete email and backup |
Malicious URL |
[SISSESG: Malicious link] |
Delete email and backup |
Content Filtering
Email type |
Additional Text to Subject |
Result |
Size is exceeded |
[SISSESG: Message too large] |
Reject email |
Banned attachment type |
[SISSESG: banned attachment] |
Attachment Deleted |
SPF Failure |
[SISSESG: SPF FAILURE] |
Reject email |
An example of the email messages follows
Scan Status Alert (as per "Delete email and backup" above) an email will be sent to the user to notify them of the deletion.
The following screen-shot displays an example of an email that has failed two checks with the subject line adjusted accordingly.
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Asked: 9/13/19, 1:47 AM |
Seen: 2299 times |
Last updated: 9/13/19, 2:41 AM |