501 5.5.4 Invalid Email address when sending email in Outlook.com custom domain

Question

I am trying to send a mail from my website through smtp.live.com port 587. I verified the credentials and even tried to send the email from Gmail by adding the account there and sending through it. On Gmail it works, on my server it doesn't

I get the following error :

{ [SenderError: Mail from command failed - 501 5.5.4 Invalid Email address] name: 'SenderError', data: '501 5.5.4 Invalid Email address' }

I am using nodemailer to send the mail

Can anyone give me some information about this error message ?

Solution

Turns out the module that sent the email didn't specify a from field and it was sending it blank. The Outlook smtp server wasn't tolerant about this and threw an error.

Specifically adding from to the email solved the problem