Hi everyone! I'm new in the forum. I would like to answer if someone knows how to relay e-mails from sendmail MTA to hotmail servers. Currently I can relay messages from sendmail to gmail locally and the mail arrives to my gmail account if I send it from a PHP script using the mail() function.
But when I change the recipient from my gmail to my hotmail account, no message arrives.
The /var/log/mail.log file says:
DSN: Service unavailable
Are the hotmail servers firewalled or something like that?
How can I send mails to my hotmail account using sendmail and the PHP function mail() just like I did with my gmail account?

Thanks in advance!