the best 3 season tents generally come with a waterproof rain fly and a breathable canopy ideally you want to find a three season tent with a waterproof floor the rugged bathtub floor is generally reserved for the more expensive four season tent but not always
The default port number of an outgoing SMTP server is  25: but a switch to another one can be needed: for instance, if you are facing issues with the SMTP connection (the client is not sending emails even if the server name is right) you can try to change the port as a troubleshooting measure.
Port 80 is the default port for http traffic. With blocked port 80 you will need to run your web server on a non-standard port. Port 25 is the default port for sending and receiving mail. ISPs block this port to reduce the amount of spam generated by worms on infected machines within their network.