When sending mail using a Symantec AntiVirus gateway product, email messages with more than 200 recipients are denied, and the following message is returned by the gateway application:
452 Too many recipients
The Symantec AntiVirus gateway product installed is one of the following:
Norton AntiVirus for Email Gateways v2.5.16 or later
Symantec AntiVirus for SMTP Gateways 3.x
Symantec Mail Security for SMTP 4.x
There are two reasons for this error message. The first is a "Message Rejected" problem. In this case the product is working as designed. This option prevents denial of service attacks based upon large recipient lists. The allowed number of recipients is twice the required maximum as set out in RFCs 821 and 2821.
The second reason is a "Delivery Attempt Failed" message configured by the receiving server. This cannot be altered from the sending end.
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