catch-all email receiver: SMTP + REST API for verification codes

.gitignore

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+node_modules/
+.env

Dockerfile

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+FROM node:20-alpine
+WORKDIR /app
+COPY package.json ./
+RUN npm install --production
+COPY server.js ./
+EXPOSE 25 3025
+CMD ["node", "server.js"]

package.json

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+{
+  "name": "desehavuz-mail",
+  "version": "1.0.0",
+  "description": "Catch-all email receiver with API for verification codes",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "smtp-server": "^3.13.0",
+    "mailparser": "^3.7.1",
+    "express": "^4.21.0"
+  }
+}

server.js

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+const { SMTPServer } = require("smtp-server");
+const { simpleParser } = require("mailparser");
+const express = require("express");
+
+const SMTP_PORT = parseInt(process.env.SMTP_PORT || "25", 10);
+const API_PORT = parseInt(process.env.API_PORT || "3025", 10);
+const API_KEY = process.env.API_KEY || "";
+const MAX_AGE_MS = 3600_000; // 1 saat
+
+const store = new Map();
+
+function extractCode(text) {
+  if (!text) return null;
+  const m = text.match(/\b(\d{4,8})\b/);
+  return m ? m[1] : null;
+}
+
+function cleanup() {
+  const now = Date.now();
+  for (const [addr, mails] of store) {
+    const fresh = mails.filter((m) => now - m.ts < MAX_AGE_MS);
+    if (fresh.length) store.set(addr, fresh);
+    else store.delete(addr);
+  }
+}
+setInterval(cleanup, 60_000);
+
+const smtp = new SMTPServer({
+  secure: false,
+  authOptional: true,
+  disabledCommands: ["STARTTLS"],
+  onData(stream, session, cb) {
+    const chunks = [];
+    stream.on("data", (c) => chunks.push(c));
+    stream.on("end", async () => {
+      try {
+        const raw = Buffer.concat(chunks);
+        const parsed = await simpleParser(raw);
+        const recipients = session.envelope.rcptTo.map((r) =>
+          r.address.toLowerCase()
+        );
+        const entry = {
+          ts: Date.now(),
+          from: parsed.from?.text || "",
+          subject: parsed.subject || "",
+          text: parsed.text || "",
+          html: parsed.html || "",
+          code: extractCode(parsed.text) || extractCode(parsed.subject),
+        };
+        for (const addr of recipients) {
+          if (!store.has(addr)) store.set(addr, []);
+          store.get(addr).push(entry);
+          if (store.get(addr).length > 50) store.get(addr).shift();
+        }
+        console.log(
+          `[MAIL] ${entry.from} -> ${recipients.join(",")} subj="${entry.subject}" code=${entry.code || "-"}`
+        );
+      } catch (e) {
+        console.error("[MAIL] parse error:", e.message);
+      }
+      cb();
+    });
+  },
+});
+
+const app = express();
+
+app.use((req, res, next) => {
+  if (API_KEY && req.headers["x-api-key"] !== API_KEY) {
+    return res.status(401).json({ error: "unauthorized" });
+  }
+  next();
+});
+
+app.get("/health", (_req, res) => {
+  res.json({ status: "ok", stored: store.size });
+});
+
+app.get("/mail/:address", (req, res) => {
+  const addr = req.params.address.toLowerCase();
+  const mails = store.get(addr) || [];
+  const limit = parseInt(req.query.limit || "10", 10);
+  res.json({ address: addr, count: mails.length, mails: mails.slice(-limit) });
+});
+
+app.get("/code/:address", (req, res) => {
+  const addr = req.params.address.toLowerCase();
+  const mails = store.get(addr) || [];
+  const last = [...mails].reverse().find((m) => m.code);
+  if (last) {
+    res.json({ address: addr, code: last.code, subject: last.subject, age_s: Math.round((Date.now() - last.ts) / 1000) });
+  } else {
+    res.json({ address: addr, code: null, message: "no code found" });
+  }
+});
+
+app.get("/codes", (_req, res) => {
+  const result = {};
+  for (const [addr, mails] of store) {
+    const last = [...mails].reverse().find((m) => m.code);
+    if (last) result[addr] = { code: last.code, age_s: Math.round((Date.now() - last.ts) / 1000) };
+  }
+  res.json(result);
+});
+
+app.delete("/mail/:address", (req, res) => {
+  store.delete(req.params.address.toLowerCase());
+  res.json({ ok: true });
+});
+
+smtp.listen(SMTP_PORT, () => console.log(`[SMTP] listening on :${SMTP_PORT}`));
+app.listen(API_PORT, () => console.log(`[API]  listening on :${API_PORT}`));
+
+smtp.on("error", (e) => console.error("[SMTP] error:", e.message));