I have Plesk freshly installed on a Debian server. My SMTP port (25) is listening but I cannot send emails from a mail client like Outlook ! I can only send and receive mails via the Webmail of Plesk. I create email account from Plesk and follow the notice. When I configure account on Outlook, the pop configuration is good (but don't receive anything) and the smtp configuration return to me an error like nothing respond. Anyone can help me ? Thank you !