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diff --git a/TODOs.md b/TODOs.md
index 84ffaad..43ad9ba 100644
--- a/TODOs.md
+++ b/TODOs.md
@@ -1,5 +1,21 @@
 # Tasks
 
+## TODO Subscribe to admin and security mailing lists of deployed software {#td-17c27497-226f-4c3d-5ad5-7cc279606963}
+- TODO in 2022-03-21
+
+---
+
+- Postfix, SpamAssasin, Dovecot;
+- Matrix, Prosody;
+- Git;
+- NGINX, fcgiwrap;
+- Prometheus, $LOG_TOOL;
+- Nextcloud;
+- Guix;
+- DNS, certbot;
+- borg;
+- Litestream.
+
 ## TODO Put "arrobaponto.org" in a variable {#td-fa5c767a-c63d-69dd-1fb4-1425ed7b219e}
 - TODO in 2022-03-20