Importance

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Abstract

Establishing trust in an email client including accepting in an email server a data communications connection from an email client, where the connection includes the email client's network address; determining from a stored list of trusted network addresses whether the email client is trusted according to the email client's network address; if the email client is not trusted according to the email client's network address, receiving authentication data from the email client and determining whether the email client is trusted according to the authentication data; and if the email client is not trusted according to the email client's network address and the email client is not trusted according to the authentication data, receiving a sender domain name for an email message from the email client and determining whether the email client is trusted according to the sender domain name.

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First Claim