I use a postfix server for my emails and i configured relay for my domain (relay.hayjayservices.com).
The problem now is that whenever i send email through my account, i get the error that authentication is required from relay.dynu.com.
I have done similar configuration for gmail account that worked perfectly well. Kindly guide me on how to configure postfix for your smtp relay.

You can check out this configuration at https://malabar.xctf.co.uk/john_crabtree_20170616-083653-BST/pub.

Thank you very much. This configuration works.

hmail server I'm having problems with this too. what relay domain and password do I use for hmail server?

Can you check if you have signed up for the correct service? Only outbound SMTP service users can send emails.

Abiodun Adeosun, could you share the example configuration that works? The original link is no longer active.

Thanks.