| 摘要 |
An e-mail firewall (<bold>105</highlight>) applies policies to e-mail messages (<bold>204</highlight>) between a first 5 site and a plurality of second sites in accordance with a plurality of administrator selectable policies (<bold>216</highlight>). The firewall comprises a simple mail transfer protocol (SMTP) relay (<bold>202</highlight>) for causing the e-mail messages (<bold>204</highlight>) to be transmitted between the first site and selected ones of the second sites. A plurality of policy managers (<bold>216</highlight>) enforce-administrator selectable policies. The policies, such as encryption and decryption policies, comprise at least a first source/destination policy (<bold>218</highlight>), at least a first content policy (<bold>202</highlight>) and at least a first virus policy (<bold>224</highlight>). The policies are characterized by a plurality of administrator selectable criteria (<bold>310</highlight>), a plurality of administrator selectable exceptions (<bold>312</highlight>) to the criteria and a plurality of administrator selectable actions (<bold>314, 316, 322</highlight>) associated with the criteria and exceptions. The policy managers comprise an access manager (<bold>218</highlight>) for restricting transmission of e-mail messages (<bold>204</highlight>) between the first site and the second sites in accordance with the source/destination policy (<bold>218</highlight>). The policy managers (<bold>216</highlight>) further comprise a content manager (<bold>220</highlight>) for restricting transmission of e-mail messages (<bold>204</highlight>) between the first site and the second sites in accordance with the content policy (<bold>220</highlight>), and a virus manager (<bold>224</highlight>) for restriction transmission of e-mail messages (<bold>204</highlight>) between the first site and the second sites in accordance with the virus policy (<bold>224</highlight>).
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