fix: smtp send email fix for self hosted instance (#10593)

Co-authored-by: Hariom Balhara <hariombalhara@gmail.com>
Co-authored-by: Leo Giovanetti <hello@leog.me>
Co-authored-by: Carina Wollendorfer <30310907+CarinaWolli@users.noreply.github.com>

packages/emails/templates/_base-email.ts

@@ -51,7 +51,7 @@ export default class BaseEmail {
       ...(parseSubject.success && { subject: decodeHTML(parseSubject.data) }),
     };
 
-    new Promise((resolve, reject) =>
+    await new Promise((resolve, reject) =>
       createTransport(this.getMailerOptions().transport).sendMail(
         payloadWithUnEscapedSubject,
         (_err, info) => {