First of all: enjoy your vacation.
Done!
I guess you are mixing up sending and receiving email. For receiving email,
Yes, probably was. However, I do have it sending mail just fine for most things - e.g. when someone sends email to support@example.com, they get an email back with ticket number and so on.
First, configure the email address(es) you'd like to use for sending out email under Admin > Email Addresses. See: http://doc.otrs.org/2.3/en/html/x1048.html
OK, have that done already
Then, go to Admin > SysConfig > Framework > Core::SendMail to configure your SMTP server address settings.
That is already set
If this is set, you can send messages. To test, you can use Admin > Admin Notification.
As mentioned above, sending messages already works. What does not work is that a message does not come out when a ticket is closed. Even though I now have it set to do that. -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"