I have been attempting to set up ISPConfig to relay email through a smtp server available at our ISP. I have followed the very good http://www.howtoforge.com/postfix_relaying_through_another_mailserver. Thank you, Falko. My ISP tells me that I need to be sending relays to smtpserver.blah.net on port 465. It is my understand, through various articles I have read, that this is accomplished by adding a colon and 465 after the server. Like this >> smtpserver.blah.net:465, then as the howto indicates, followed by a space and the email@example.com:userpassword. I am tailing the mail.log and still seeing server connections at port 25 that are timing out. And no mail relay happening (I think.) Should this not be port 465 timing out? I must admit that I am not sure how to test this, but I have yet to receive a test email sent to myself at a different address. As I am using dynamic dns services through dyndns, I need to use email relay to send emails. I am able to receive emails on my ISPConfig server, just cannot send. Am I setting the port correctly, our is this handled differently in postfix?