use esmtp size extension (rfc1870) patch by ch.ey@gmx.net, r/sr=bienvenu

suite/locales/en-US/chrome/mailnews/compose/composeMsgs.properties

@@ -207,6 +207,15 @@ noIdentities=You don't have any email identities yet.  Create one with the Accou
 ## LOCALIZATION NOTE: this string must be using only US_ASCII characters
 12566=undisclosed-recipients
 
+## @name NS_ERROR_SMTP_TEMP_SIZE_EXCEEDED
+12567=The size of the message you are trying to send exceeds a temporary size limit of the server. The message was not sent, try to reduce the message size and try again. The server responded:  %s.
+
+## @name NS_ERROR_SMTP_PERM_SIZE_EXCEEDED_1
+12568=The size of the message you are trying to send exceeds the global size limit (%d bytes) of the server. The message was not sent, try to reduce the message size and try again.
+
+## @name NS_ERROR_SMTP_PERM_SIZE_EXCEEDED_2
+12569=The size of the message you are trying to send exceeds the global size limit of the server. The message was not sent, try to reduce the message size and try again. The server responded:  %s.
+
 ## Strings use for the save message dialog shown when the user close a message compose window
 saveDlogTitle=Save Message
 saveDlogMessage=Message has not been sent. Do you want to save the message in the Drafts folder?