Hi

I was making my new site locally with wamserver.
To finish my site I have migrated it to an online server. It is now on a subdomain name.

I have problems with my mail.
Locally I got an error saying there are problems sending the mail.
This same message keeps appearing as wel on the online server.

For examploe, when I create a new account, or when going to the checkout of my shop, or when filling out the contact form...

I first installed drupal on the server and afterwards I migrated the database and files to get my theme (porto) working.

What could be the problem?

Regards,

Mark