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diff --git a/mailnews/mime/src/extraMimeParsers.jsm b/mailnews/mime/src/extraMimeParsers.jsm
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function parseNewsgroups(headers) {
+ let ng = [];
+ for (let header of headers) {
+ ng = ng.concat(header.split(/\s*,\s*/));
+ }
+ return ng;
+}
+
+function emitNewsgroups(groups) {
+ // Don't encode the newsgroups names in RFC 2047...
+ if (groups.length == 1)
+ this.addText(groups[0], false);
+ else {
+ this.addText(groups[0], false);
+ for (let i = 1; i < groups.length; i++) {
+ this.addText(",", false); // only comma, no space!
+ this.addText(groups[i], false);
+ }
+ }
+}
+
+jsmime.headerparser.addStructuredDecoder("Newsgroups", parseNewsgroups);
+jsmime.headerparser.addStructuredDecoder("Followup-To", parseNewsgroups);
+jsmime.headeremitter.addStructuredEncoder("Newsgroups", emitNewsgroups);
+jsmime.headeremitter.addStructuredEncoder("Followup-To", emitNewsgroups);