1 files changed, 9 insertions, 2 deletions
diff --git a/services/docker/mail-server/aws-sendmail/mail.ts b/services/docker/mail-server/aws-sendmail/mail.ts
index 98afcaa..b974e49 100644
--- a/services/docker/mail-server/aws-sendmail/mail.ts
+++ b/services/docker/mail-server/aws-sendmail/mail.ts
@@ -163,14 +163,21 @@ export class Mail {
     return headers;
   }
 
-  simpleGetDate(): Date | null {
+  /**
+   * Find the Date header and parse it to date.
+   * @param invalidToNull Whether to convert invalid date to null. Default is false.
+   * @returns Parsed date (may be an invalid date if `invalidToNull` us false).
+   * `null` if the date header is missing or parsing fails and `invalidToNull`
+   * is true.
+   */
+  simpleGetDate<T = null>(invalidValue: T | null = null): Date | T | null {
     const headers = this.simpleParseHeaders();
     for (const [key, value] of headers) {
       if (key.toLowerCase() === "date") {
         const date = new Date(value);
         if (isNaN(date.getTime())) {
           getLogger().warn(`Invalid date string (${value}) found in header.`);
-          return null;
+          return invalidValue;
         }
         return date;
       }