CreateReply problem when ReplyTo is set

Hello,
if I use the CreateReply method on a MailMessage with ReplyTo filled in, the To field contains both From and Reply to mail addresses.

Example.
OriginalMessage.From = "user-one@domain.com"
OriginalMessage.To = "user-two@domain.com"
OriginalMessage.CC = "user-three@domain.com,user-four@domain.com"
OriginalMessage.ReplyTo = "user-five@domain.com"

ReplyMessage = OriginalMessage.CreateReply("user-two@domain.com", ReplyBodyTransformation.KeepOriginal, true)

Result:
ReplyMessage.From = "user-two@domain.com"
ReplyMessage.To = "user-one@domain.com,user-five@domain.com"
ReplyMessage.CC = "user-three@domain.com,user-four@domain.com"

ReplyMessage.To should contains only "user-five@domain.com" how all email clients work.

Thanks and Best Regards.