remailing
/ˌriːˈmeɪlɪŋ/noun
1Originally and chiefly North American. The action or an act of posting a letter, etc., for a second or further time.
2 Computing. The action or process of remailing an email in order to conceal the identity of the original sender. Usually attributive Compare remailer.
Origin
Mid 19th century. From re- + mailing.