We recently moved our Drupal sites to a Linode server. One of those sites has a lot of users filling forms.
The previous server sent, with no problem, all form registrations to an email address, this is not the case for our new Linode server. Some user registrations never get delivered to the appropriated inboxes.
Do we need to install a mail server (sendmail, postfix) to get the PHP mail function running smoothly as in the previous server?
If yes, a great link to get us started would be appreciated.
If no, what should we do to get the mail function working correctly?