back out part of amasari@netscape.com's checkin. no reviewer, because this

string should never have been removed in the first place!
thanks to timeless@bemail.org for finding the error

mailnews/base/prefs/resources/locale/en-US/am-identity-advanced.dtd

@@ -2,6 +2,4 @@
 <!-- LOCALIZATION NOTE (smtpDesc.label): DONT_TRANSLATE "SMTP" -->
 <!ENTITY smtpDesc.label "When sending mail from this identity, always use the following Outgoing (SMTP) server:">
 <!ENTITY smtpName.label "Server:">
-
-
-
+<!ENTITY smtpDefaultServer.label "Always use default server">