On 2018-09-20 9:16 p.m., Carlos E. R. wrote:
Carlos E. R. wrote:
On 20/09/2018 11.39, Per Jessen wrote:
Carlos E. R. wrote:
Okay, I'm surprised [Telefonica] doen't block that. It's usually the very first anti-spam measure access providers use. Well, that's the thing, they don't block any port that I know. You may be able to browse windows computers shares across internet here. I remember that I got such attempts when I was using a modem, not a router with NAT. I have not heard of anyone blocking outbound traffic on anything but
On 20/09/2018 10.28, Per Jessen wrote: port 25.
And I like they don't block anything! I find disgusting that Bell is blocking my access to Telefonica. If someone is using the net to spam, kill that person full access, not everybody access to some port.
It is simple, if someone uses port 25, investigate. A waste of time and effort. It is even simpler, block 25, let everyone use 587, as it was always intended. Port 25 is for MTA-to-MTA transfers. I find blocking 25 intrusive on my freedom.
Tough! Post 25 is unencrypted, unverified SMTP, aka free for anyone to use, including hackers, spammer broadcasters and scam artists who use it as an open relay. That is why port 465 &SSL/TLS are used, and why many ISPs also restrict, in various ways, access to known customers. OBTW: I would not say "always" as in 'always intended'. Originally back at the beginning of the 1980s when this was DARPANET and all nodes were trusted and RFC821 was current then port 25 was used. Then the Internet went commercial and some 'commercial interests' began abusing email: spam and other nasties. Discontinuing the use of port 25 and open relays was the response to that abuse. -- A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting frowned upon? -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org