diff --git a/org.springframework.integration.mail/src/main/java/org/springframework/integration/mail/config/spring-integration-mail-1.0.xsd b/org.springframework.integration.mail/src/main/java/org/springframework/integration/mail/config/spring-integration-mail-1.0.xsd
index 684030de26..56fe412c89 100644
--- a/org.springframework.integration.mail/src/main/java/org/springframework/integration/mail/config/spring-integration-mail-1.0.xsd
+++ b/org.springframework.integration.mail/src/main/java/org/springframework/integration/mail/config/spring-integration-mail-1.0.xsd
@@ -24,6 +24,7 @@
 				</xsd:documentation>
 			</xsd:annotation>
 			<xsd:attribute name="id" type="xsd:string"/>
+			<xsd:attribute name="channel" type="xsd:string"/>
 			<xsd:attribute name="mail-sender" type="xsd:string"/>
 			<xsd:attribute name="host" type="xsd:string"/>
 			<xsd:attribute name="port" type="xsd:string"/>