1 Long: mail-auth 2 Arg: <address> 3 Protocols: SMTP 4 Help: Originator address of the original email 5 Added: 7.25.0 6 See-also: mail-rcpt mail-from 7 Category: smtp 8 --- 9 Specify a single address. This will be used to specify the authentication 10 address (identity) of a submitted message that is being relayed to another 11 server. 12