Carlos E. R. wrote:
On 20/09/2018 13.05, James Knott wrote:
On 09/20/2018 12:50 PM, Carlos E. R. wrote:
I find blocking 25 intrusive on my freedom.
You find it intrusive on your freedom to do something you shouldn't be doing?
I'm not doing anything I shouldn't.
SMTP was created way back in the dark ages, when people used terminals to connect to computers and programs on that computer to read/write mail. Back then, SMPT was used to transfer mail between computers. There was no concept of email clients back then. When those clients started appearing, they used POP and SMTP to provide email to personal computers. That situation resulted in port 25 being used for spam, as there was nothing to stop that. Then ISPs stopped passing port 25 on to other servers, just to block that spam. As mentioned, there are other ports for sending email from clients and they should be used. If your ISP doesn't support that, then they are part of the problem.
Well, Telefónica is apparently managing to block spam without blocking 25. For instance, by requesting authorization on connect to 25. Everybody does that, even gmail.
s/everybody/somebody/ Anyway, I think maybe you are missing the point. It is not about connecting to Telefonicas smarthost, it is about connecting to some other mailhost out there. See my example from earlier, Carlos Shop SA.
When I developed software, security was not a concern. Oh, those were the days... ;-p
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