Will the antispam features affect mailing list subscriptions?
Most mailing list subscriptions will not be identified as spam. However, to ensure that mailing list messages are not identified as spam, place the domain name from which the mailing list is sent in the Trusted Addresses list. For more information, see Creating Trusted DNS Black Lists. If you do not trust the domain, you can create a host rule to send the message to a folder for the user (for example, spam), and the user can create a user rule that puts the message in his/her Inbox. For more information, see Using Delivery Rules to Filter Spam.