--- a/mailnews/intl/charsetData.properties
+++ b/mailnews/intl/charsetData.properties
@@ -18,20 +18,18 @@
 ## charset_name.LangGroup = 
 ##
 ## charset_name.isMultibyte = multi byte charsets
 
 x-mac-arabic.isInternal                 = true
 x-mac-farsi.isInternal                  = true
 x-mac-hebrew.isInternal                 = true
 x-imap4-modified-utf7.isInternal        = true
-t.61-8bit.isInternal                    = true
 replacement.isInternal                  = true
 
-t.61-8bit.notForOutgoing                = true
 utf-7.notForOutgoing                    = true
 x-imap4-modified-utf7.notForOutgoing    = true
 ibm1125.notForOutgoing                  = true
 ibm1131.notForOutgoing                  = true
 iso-8859-8.notForOutgoing               = true
 replacement.notForOutgoing              = true
 
 # XXX : there are some entries only necessary for Gtk/Xlib builds
@@ -85,17 +83,16 @@ iso-8859-6.LangGroup               = ar
 iso-8859-7.LangGroup               = el
 iso-8859-8.LangGroup               = he
 iso-8859-8-i.LangGroup             = he
 jis_0208-1983.LangGroup            = ja
 koi8-r.LangGroup                   = x-cyrillic
 koi8-u.LangGroup                   = x-cyrillic
 shift_jis.LangGroup                = ja
 windows-874.LangGroup              = th
-t.61-8bit.LangGroup                = x-western
 utf-8.LangGroup                    = x-unicode
 utf-16.LangGroup                   = x-unicode
 utf-16be.LangGroup                 = x-unicode
 utf-16le.LangGroup                 = x-unicode
 utf-7.LangGroup                    = x-unicode
 x-imap4-modified-utf7.LangGroup    = x-unicode
 replacement.LangGroup              = x-unicode
 windows-1250.LangGroup             = x-central-euro

--- a/mailnews/intl/charsetalias.properties
+++ b/mailnews/intl/charsetalias.properties
@@ -13,17 +13,16 @@
 # labelsencodings.properties. Besides aliases it contains labels for charsets
 # that are not part of the HTML5 world, but still are supported for e-mail.
 
 646=windows-1252
 iso-8859-1=ISO-8859-1
 utf-16=UTF-16
 utf-7=UTF-7
 gb2312=GB2312
-t.61-8bit=T.61-8bit
 hz-gb-2312=HZ-GB-2312
 
 # Netscape private ...
 x-imap4-modified-utf7=x-imap4-modified-utf7
 x-mac-ce=x-mac-ce
 x-mac-turkish=x-mac-turkish
 x-mac-greek=x-mac-greek
 x-mac-icelandic=x-mac-icelandic
@@ -82,21 +81,16 @@ zh_cn.euc=GB2312
 gb_2312=GB2312
 
 # Aliases for windows-874 
 tis620=windows-874
 
 # Aliases for IBM866
 cp-866=IBM866
 
-# Aliases for T.61-8bit
-t.61=T.61-8bit
-iso-ir-103=T.61-8bit
-csiso103t618bit=T.61-8bit
-
 # Aliases for UTF-7
 x-unicode-2-0-utf-7=UTF-7
 unicode-2-0-utf-7=UTF-7
 unicode-1-1-utf-7=UTF-7
 csunicode11utf7=UTF-7
 
 # Aliases for ISO-10646-UCS-2
 csunicode=UTF-16BE