actually start on mailing, fix email regex

types/lib/index.ts

@@ -1 +1,2 @@
 export * from "./validation";
+export * from "./mailer";

types/lib/mailer.ts

@@ -0,0 +1,45 @@
+import type { Attachment } from "nodemailer/lib/mailer";
+
+interface TemplateVariables {
+	[key: string]: string | number | boolean;
+}
+
+interface SendMailOptions {
+	to: string | string[];
+	subject: string;
+	cc?: string | string[];
+	bcc?: string | string[];
+	from?: string;
+	replyTo?: string;
+	template?: string;
+	templateVariables?: TemplateVariables;
+	html?: string;
+	text?: string;
+	attachments?: Attachment[];
+	priority?: "high" | "normal" | "low";
+	headers?: Record<string, string>;
+}
+
+type MailerConfig = {
+	address: string;
+	port: number;
+	from: string;
+	username: string;
+	password: string;
+	secure: boolean;
+	pool: boolean;
+	connectionTimeout: number;
+	socketTimeout: number;
+	maxConnections: number;
+	maxMessages: number;
+	replyTo: string;
+};
+
+type EmailResult = {
+	success: boolean;
+	messageId?: string;
+	response?: string;
+	error?: string;
+};
+
+export type { TemplateVariables, SendMailOptions, MailerConfig, EmailResult };