Google Message Security Troubleshooting Guide Manuel d'utilisateur télécharger pdf (Page 54)

Frequently Asked Questions 55

You will see a list of alias addresses, sorted by organization. This information

is compiled monthly, so recent changes will not be included in this report.

Virus

Why was this virus apparently delivered despite virus

blocking?

1. Confirm your inbound virus blocking is configured correctly. It is especially

important to confirm the organization’s Non-Account Virus Blocking feature

and the Default User’s Virus Blocking field are enabled. For more information,

see Configure Inbound Virus Blocking.

2. Often the user or mailing list receiving the message is not registered in the

email security service. Check the headers of the virus email to determine the

recipient and to see whether the message was sent directly to and was

accepted by your mail server, bypassing the email security service.

a. Search the message headers for X-pstnvirus header. If this header is

present, the message went to a registered recipient and was filtered for a

virus. For more information, see X-pstnvirus Header.

b. Confirm all of your user addresses and mailing lists are registered with

the email security service. Messages to unregistered users and mailing

lists are delivered unfiltered. For more information, see Search for Users.

Why does Virus Blocking seem to be blocking legitimate

messages?

Virus Blocking either quarantines or blocks all fragmented messages, since

fragmented messages cannot be properly scanned. Message fragmenting is not

used widely since most mail messages can be sent within the SMTP standard

using the common networking technologies and processing power of today’s

computers.

For more information on Virus Fragment Blocking, see Configure Virus Settings

for an Organization.

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Google Message Security Troubleshooting Guide Manuel d'utilisateur Page 54