diff --git a/notify-email/action.yml b/notify-email/action.yml
index 437a194..087b7e8 100644
--- a/notify-email/action.yml
+++ b/notify-email/action.yml
@@ -53,16 +53,20 @@ runs:
           RCPT_ARGS="$RCPT_ARGS --mail-rcpt $(printf '%s' "$addr" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//')"
         done
         unset IFS
+
+        # 整封邮件拼好（headers + 空行 + body）从 stdin 给 curl --upload-file -
+        # 避开 "-H + --upload-file -" 组合在 smtps:// 下不生效的 bug（curl 不会把 -H
+        # 头部合并进 DATA 段，结果只发空 body）。v1.0.0 是这么写的，1.0.1 改成全量 stdin。
+        # 同时给出一个明确的 Date 头部，避免 163 反垃圾系统把无 Date 的邮件归类。
+        DATE_HDR=$(date -R)
+        EMAIL=$(printf 'From: %s\nTo: %s\nSubject: %s\nMIME-Version: 1.0\nContent-Type: text/plain; charset=UTF-8\nDate: %s\n\n%s' \
+                       "$FROM_ADDR" "$TO_ADDR" "$SUBJECT" "$DATE_HDR" "$BODY")
         # shellcheck disable=SC2086
-        if ! printf '%s' "$BODY" | curl -fsS --ssl \
+        if ! printf '%s' "$EMAIL" | curl -fsS --ssl \
             --url "smtps://${SMTP_HOST}:${SMTP_PORT}" \
             --user "${SMTP_USER}:${SMTP_PASS}" \
             --mail-from "${FROM_ADDR}" \
             $RCPT_ARGS \
-            -H "Subject: ${SUBJECT}" \
-            -H "From: ${FROM_ADDR}" \
-            -H "To: ${TO_ADDR}" \
-            -H "Content-Type: text/plain; charset=UTF-8" \
             --max-time 15 --retry 2 \
             --upload-file -; then
           echo "::warning::Email send failed (non-fatal)"