You would like to know what Symantec policy is regarding outbound email through Symantec's Hosted Mail Security service.
The following standards apply to the delivery of outbound email through the Hosted Mail Security and at Symantec’s sole discretion we may enforce the following policies:
Our servers will not accept connections from unsecured systems. These include open relays, open proxies, open routers, or any other system that has been determined to be available for unauthorized use.
Our mail servers will not accept connections from systems that use dynamically assigned or residential IP addresses.
We will not deliver email that contains a hex-encoded Universal Resource Locator (URL). (Ex: http://%6d%6e%3f/)
Our mail servers will reject messages with more than 100 recipients.
Our mail servers will reject messages with attachments that exceed 100MB.
Our servers will reject connections from servers that consistently generate a higher than 10% invalid recipient rate (i.e. over 10% of a sender's mailing list is destined for users that do not exist).
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