Created Mail configurations (markdown)

Mail-configurations.md

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+# msmtp error: "account default was already defined in this file"
+
+This error happens when using msmtp with several accounts. Error was solved upstream https://gitlab.marlam.de/marlam/msmtp/issues/26#note_202. You can add to your overlay while waiting for the fix to reach nixpkgs:
+
+    msmtp = super.msmtp.overrideAttrs(oa: {
+      buildInputs = [ super.pkgs.texinfo ];
+
+      src = builtins.fetchurl {
+        url = "https://gitlab.marlam.de/marlam/msmtp/repository/archive.tar.gz?ref=9f9948732a0153a54f7324873fdb5cafbcd9d2d6"; 
+        sha256 = "1b0062h1ik5i78wv26vmfsgk4bl434dlci62l6pz148hvw6nkpjp";
+      };
+    });
+
+
+# how to have mbsync automatically update notmuch
+
+Wrap the mbsync executable
+    programs.mbsync = {
+      enable = true;
+      package = pkgs.writeShellScriptBin "mbsync" ''
+      ${pkgs.isync}/bin/mbsync $@
+      notmuch new
+      '';
+    };
+