diff --git a/actual_imap_poll/watcher.py b/actual_imap_poll/watcher.py
index 33e6a85..485ce0a 100644
--- a/actual_imap_poll/watcher.py
+++ b/actual_imap_poll/watcher.py
@@ -43,7 +43,7 @@ class AppConfig(BaseSettings):
     imap_port: int = Field(default=143)
     imap_mailbox: str = Field(default="INBOX")
     imap_interval: int = Field(default=300)
-    imap_starttls: bool = Field(default=True)
+    imap_starttls: bool = Field(default_factory=lambda data: not data["imap_tls"])
     imap_tls: bool = Field(default_factory=lambda data: data["imap_port"] == 993)
 
     model_config = {"env_prefix": ""}