website: Updated mailing list subscription links

Change-Id: Iaeaa66ecf36e3671f90b734355b2fd79bc4a369b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/28028
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
diff --git a/_pages/mailing_list.md b/_pages/mailing_list.md
index 2dc578a..e5a9321 100644
--- a/_pages/mailing_list.md
+++ b/_pages/mailing_list.md
@@ -6,14 +6,17 @@
 
 There are three mailing lists for gem5:
 
-* gem5-dev ([subscribe](http://m5sim.org/mailman/listinfo/gem5-dev)) ---
-Discussions regarding gem5 development. Bug reports should be submitted to our
+* gem5-dev ([subscribe](
+https://lists.gem5.org/postorius/lists/gem5-dev.gem5.org/)) --- Discussions
+regarding gem5 development. Bug reports should be submitted to our
 [Jira Issue Tracker](https://gem5.atlassian.net), though the gem5-dev mailing
 list can be used to discuss bugs in greater detail.
-* gem5-users ([subscribe](http://m5sim.org/mailman/listinfo/gem5-users)) ---
-General discussions about gem5 and its use.
-* gem5-announce ([subscribe](http://m5sim.org/cgi-bin/mailman/listinfo/gem5-announce)) ---
-General gem5 annoucements. 
+* gem5-users ([subscribe](
+https://lists.gem5.org/postorius/lists/gem5-users.gem5.org/)) --- General
+discussions about gem5 and its use.
+* gem5-announce ([subscribe](
+https://lists.gem5.org/postorius/lists/gem5-announce.gem5.org)) --- General
+gem5 annoucements.
 
 # Mail Archive