Implement Mail service.

service/mail/context.go

Index: service/mail/context.go
diff --git a/service/user/context.go b/service/mail/context.go
similarity index 85%
copy from service/user/context.go
copy to service/mail/context.go
index 21061667e825d2daa91f650b699b345b983fb8f7..d17287c1bdce19b19803f96bd470e277bc206f30 100644
--- a/service/user/context.go
+++ b/service/mail/context.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package user
+package mail
 
 import (
 	"golang.org/x/net/context"
@@ -19,8 +19,8 @@ var (
 // SetFactory.
 type Factory func(context.Context) Interface
 
-// Filter is the function signature for a filter user implementation. It
-// gets the current user implementation, and returns a new user implementation
+// Filter is the function signature for a filter mail implementation. It
+// gets the current mail implementation, and returns a new mail implementation
 // backed by the one passed in.
 type Filter func(context.Context, Interface) Interface
 
@@ -41,7 +41,7 @@ func getCurFilters(c context.Context) []Filter {
 	return nil
 }
 
-// Get pulls the user service implementation from context or nil if it
+// Get pulls the mail service implementation from context or nil if it
 // wasn't set.
 func Get(c context.Context) Interface {
 	ret := getUnfiltered(c)
@@ -54,13 +54,13 @@ func Get(c context.Context) Interface {
 	return ret
 }
 
-// SetFactory sets the function to produce user.Interface instances,
+// SetFactory sets the function to produce mail.Interface instances,
 // as returned by the Get method.
 func SetFactory(c context.Context, f Factory) context.Context {
 	return context.WithValue(c, serviceKey, f)
 }
 
-// Set sets the user service in this context. Useful for testing with a quick
+// Set sets the mail service in this context. Useful for testing with a quick
 // mock. This is just a shorthand SetFactory invocation to set a factory which
 // always returns the same object.
 func Set(c context.Context, u Interface) context.Context {