(*valid in 11.3*)
(* the right configuration could be found at mail service site*)
 fSetMailOptions[] :=
        MailSettings -> <|
        "Server" -> "smtp.yahoo.com",
        "PortNumber" -> 25,
        "EncryptionProtocol" -> None,
        "From" -> "youraccount@yahoo.com",
        "FullName" -> "youraccount@yahoo.com",
        "ReplyTo" -> "youraccount@yahoo.com",
        "UserName" -> "youraccount@yahoo.com",
        "Password" -> Uncompress["1:eJxTTMoPCuZhYGCozC8tKkgsLi7PL0oBAEFEBuY="](*Compress["yourpassword"*)*)
        |>


fSendMail[tolist_?ListQ, title_, body_, attachslist_?ListQ] :=
        SendMail[tolist, {title, body, attachslist},
        Evaluate@fSetMailOptions[]]

fSendMail[{"xman@yahoo.com","spideman@google.com"},"Greetings","Hello, Happy New Year!",{"c:\temp\card1.jpg","c:\temp\card2.jpg"}]