Hello,

I see you're trying to send emails using Nodemailer with Gmail from your Vercel deployment. There are a few reasons why this might not be working:

Common Issues with Email on Vercel

1. Vercel Functions Limitations: Vercel recommends using third-party mail services rather than relying on the outgoing SMTP connection of your Vercel Function .
2. Gmail Authentication: Gmail's security policies often block "less secure apps" from sending emails with just a password. You need to use an App Password instead.
3. Function Timeouts: Vercel Functions have execution time limits, and email sending might time out if the upstream service (Gmail) is slow to respond .

Recommended Solution

The best approach is to use a dedicated email service provider. Vercel officially recommends these services :

• Resend
• Postmark
• SendGrid
• AWS SES
• MailChimp

@sibghatullah295295 Vercel is serverless, so accessing the file system, etc. like a typical backend would probably won't work. I know there are also problems using nodemailer on Vercel (I've been through this on my website…). Vercel has an article about sending emails that might help: https://vercel.com/guides/sending-emails-from-an-application-on-vercel