Update app/utils/emailer.py

app/utils/emailer.py

@@ -1,12 +1,8 @@
 import smtplib
 from email.mime.text import MIMEText
-from email.utils import formataddr
+from app.config import settings
 import hashlib
 from typing import List, Tuple
-from app.config import settings
-
-
-
 
 def choose_subject(email: str, subject_a: str, subject_b: str) -> Tuple[str, str]:
     # 受信者でハッシュ→安定的にA/B割当（50/50）
@@ -14,9 +10,6 @@ def choose_subject(email: str, subject_a: str, subject_b: str) -> Tuple[str, str
     variant = "A" if (h % 2 == 0) else "B"
     return (subject_a if variant == "A" else subject_b), variant
 
-
-
-
 def send_email(recipients: List[str], subject_a: str, subject_b: str, body_md: str) -> list:
     results = []
     for rcpt in recipients:
@@ -26,10 +19,10 @@ def send_email(recipients: List[str], subject_a: str, subject_b: str, body_md: s
         msg["From"] = settings.EMAIL_FROM
         msg["To"] = rcpt
 
-
         with smtplib.SMTP(settings.SMTP_HOST, settings.SMTP_PORT) as s:
             s.starttls()
-            s.login(settings.SMTP_USERNAME, settings.SMTP_PASSWORD)
-            s.sendmail(settings.SMTP_USERNAME, [rcpt], msg.as_string())
+            if settings.SMTP_USERNAME and settings.SMTP_PASSWORD:
+                s.login(settings.SMTP_USERNAME, settings.SMTP_PASSWORD)
+            s.sendmail(settings.SMTP_USERNAME or "", [rcpt], msg.as_string())
         results.append({"to": rcpt, "variant": variant, "subject": subject})
-    return results
+    return results