diff --git a/defaults/main.yml b/defaults/main.yml
index 472860f..90a1a8b 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -45,6 +45,13 @@ dovecot_enabled: true
 # Protocols to enable (imap, pop3, lmtp)
 dovecot_protocols: "imap pop3 lmtp"
 
+# IMAP capability adjustments. Set to modify advertised IMAP capabilities.
+# Use +CAPABILITY to add, -CAPABILITY to remove.
+# Example: "+IMAP4rev1 -LITERAL+ -NOTIFY" removes modern extensions that
+# might suppress standard untagged responses.
+# Leave empty to use Dovecot defaults.
+dovecot_imap_capability: ""
+
 # Mail storage location. Using Maildir in the user's home directory.
 dovecot_mail_location: "maildir:~/Maildir"
 
diff --git a/templates/dovecot.conf.j2 b/templates/dovecot.conf.j2
index 49e85b1..36604db 100644
--- a/templates/dovecot.conf.j2
+++ b/templates/dovecot.conf.j2
@@ -2,6 +2,12 @@
 # Ansible managed: {{ ansible_managed }}
 
 protocols = {{ dovecot_protocols }}
+{% if dovecot_imap_capability | default('') | length > 0 %}
+
+protocol imap {
+  imap_capability = {{ dovecot_imap_capability }}
+}
+{% endif %}
 
 # Dictionary of configuration files
 !include conf.d/*.conf