Those ports are not important, they are for my client to connect to my server, which happens entirely within my LAN, but how do I go about SENDING mail if outgo

Those ports are not important, they are for my client to connect to my server, which happens entirely within my LAN, but how do I go about SENDING mail if outgoing connections on ports 25, 587, and 465 are blocked ? Basically, I want to send a mail to you, your server is listening on those ports because you're a normal person, and didn't rediret port 80 to be your SNMP incoming. So, I try to make a connection to your domain:25, my packets won't even leave my ISP, my outgoing connection is simply dropped. Try it, are you lucky enough that you can ? If you speak a bit of SMTP you can send email from telnet like that.