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queue: Use a local envelope-from when forwarding

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If there's an alias to forward email to a non-local domain, using the original
From is problematic, as we may not be an authorized sender for it.

Some MTAs (like Exim) will do it anyway, others (like gmail) will construct a
special address based on the original address.

This patch implements the latter approach, which is safer and allows the
receiver to properly enforce SPF.

We construct a (hopefully) reasonable From based on the local user, and
embedding the original From (but transformed for IDNA, as the receiver may not
support SMTPUTF8).
This commit is contained in:
Alberto Bertogli
2016-10-03 00:49:32 +01:00
parent afd79dfd8d
commit 55b03c8cf0
6 changed files with 83 additions and 41 deletions
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58
internal/queue/queue.pb.go
View File

@@ -110,10 +110,16 @@ func (m *Message) GetCreatedAtTs() *google_protobuf.Timestamp {
}
type Recipient struct {
// Address to send the message to.
// This is the final one, after expanding aliases.
Address string `protobuf:"bytes,1,opt,name=address" json:"address,omitempty"`
Type Recipient_Type `protobuf:"varint,2,opt,name=type,enum=queue.Recipient_Type" json:"type,omitempty"`
Status Recipient_Status `protobuf:"varint,3,opt,name=status,enum=queue.Recipient_Status" json:"status,omitempty"`
LastFailureMessage string `protobuf:"bytes,4,opt,name=last_failure_message,json=lastFailureMessage" json:"last_failure_message,omitempty"`
// Address that this recipient was originally intended to.
// This is before expanding aliases and only used in very particular
// cases.
OriginalAddress string `protobuf:"bytes,5,opt,name=original_address,json=originalAddress" json:"original_address,omitempty"`
}
func (m *Recipient) Reset() { *m = Recipient{} }
@@ -131,29 +137,31 @@ func init() {
func init() { proto.RegisterFile("queue.proto", fileDescriptor0) }
var fileDescriptor0 = []byte{
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