nodemailer and sendgrid integration

packages/lib/mail/sendSignedMail.ts

@@ -0,0 +1,12 @@
+import { sendMail } from "./sendMail";
+import { NEXT_PUBLIC_WEBAPP_URL } from "@documenso/lib/constants";
+
+export const sendSignedMail = async (document: any, recipient: any) => {
+  // todo check if recipient has an account
+
+  sendMail(
+    document.user.email,
+    `${recipient.email} signed ${document.title}`,
+    `Hi ${document.user.name}, ${recipient.email} has signed your document ${document.title}. Click <a href="${NEXT_PUBLIC_WEBAPP_URL}/document/${document.id}"> VIEW DOCUMENT</a> to view it now.`
+  );
+};