(bug)(subscription) promisify mailer – otherwise when sending subscriptions, emails are marked as sent even if there's been an error

in this case: "454 Throttling failure: Maximum sending rate exceeded."

server/mailer.ts

@@ -23,30 +23,32 @@ if (!transport && process.env.NODE_ENV === 'development') {
 }
 const transporter = nodemailer.createTransport(transport);
 
-const sendEmail = (
+const sendEmail = async (
     to: string,
     subject: string,
     text: string | undefined = undefined,
     html: string | undefined = undefined,
     from: string | undefined = undefined,
-): void => {
-    transporter.sendMail({
-        to,
-        subject,
-        text,
-        html,
-        from: from || process.env.MAILER_FROM,
-    }, function (err, info) {
+): Promise<void> => {
+    try {
+        const info = await transporter.sendMail({
+            to,
+            subject,
+            text,
+            html,
+            from: from || process.env.MAILER_FROM,
+        });
+
         if (process.env.NODE_ENV === 'development') {
             const streamInfo = info as StreamTransport.SentMessageInfo;
             if (streamInfo.message) {
                 (streamInfo.message as Readable).pipe(process.stdout);
             }
         }
-        if (err) {
-            Sentry.captureException(err);
-        }
-    });
+    } catch (err) {
+        Sentry.captureException(err);
+        throw err;
+    }
 };
 
 const findTranslation = (key: string) => {
@@ -244,12 +246,12 @@ const applyTemplate = (
     return templateText;
 };
 
-export default (to: string, template: string | Template, params = {}): void => {
+export default async (to: string, template: string | Template, params = {}): Promise<void> => {
     if (typeof template === 'string') {
         template = templates[template];
     }
 
-    sendEmail(
+    await sendEmail(
         process.env.MAILER_OVERWRITE || to,
         applyTemplate(template, 'subject', params),
         applyTemplate(template, 'text', params),