diff --git a/cmdeploy/src/cmdeploy/__init__.py b/cmdeploy/src/cmdeploy/__init__.py
index cae7885..d09e1a7 100644
--- a/cmdeploy/src/cmdeploy/__init__.py
+++ b/cmdeploy/src/cmdeploy/__init__.py
@@ -522,6 +522,23 @@ def deploy_chatmail(config_path: Path) -> None:
         packages="postfix",
     )
 
+    # Add our OBS repository for dovecot_no_delay
+    files.put(
+        name = "Add Deltachat OBS GPG key to apt keyring",
+        src = importlib.resources.files(__package__).joinpath("obs-home-deltachat.gpg"),
+        dest = "/etc/apt/keyrings/obs-home-deltachat.gpg",
+        user="root",
+        group="root",
+        mode="644",
+    )
+
+    files.line(
+        name = "Add DeltaChat OBS home repository to sources.list",
+        path = "/etc/apt/sources.list",
+        line = "deb [signed-by=/etc/apt/keyrings/obs-home-deltachat.gpg] https://download.opensuse.org/repositories/home:/deltachat/Debian_12/ ./",
+        ensure_newline = True,
+    )
+
     apt.packages(
         name="Install Dovecot",
         packages=["dovecot-imapd", "dovecot-lmtpd", "dovecot-sieve"],
diff --git a/cmdeploy/src/cmdeploy/obs-home-deltachat.gpg b/cmdeploy/src/cmdeploy/obs-home-deltachat.gpg
new file mode 100644
index 0000000..e69de29