On Mon 28 Jul 2014 at 16:05:11 -0400, Jerry Stuckle wrote: > On 7/28/2014 1:16 PM, Brian wrote: > > > All my mail from home is sent directly using exim which, as far as I can > > make out will only send on port 25. Leaving aside what you say below (my > > ISP does not block outgoing port 25 traffic) I should not be affected? > > > > Exim can use other ports also. It's all in the configuration. (but > sorry, I do not have enough expertise to tell you exactly how to do it).
Exim will definitely *receive* mail on multiple ports; that much I do know. Sending on other than port 25 would appear to contradict the idea that MTAs only communicate over port 25. But I'll look into it. > > So, in world where every ISP blocks outgoing port 25 connections the > > delivering of one's own mail becomes impossible. The flow of spam and > > malware across the net will continue to increase though, I suppose. > > No, it just means you need to connect to a mail server via port 587, > then have it send the email. If exim cannot send over port 587......... And how do I know the mail server I'm connecting to is accepting on port 587? I don't think mine does; I'll have to check. I'm provisionally of the same opinion as expressed above; the flow of communication is controlled. > If spammers can't use compromised machines, it severely limits the > number of servers they can use. And since an IP can be blacklisted if > too much spam is sent through it, responsible hosting companies and ISPs > (i.e. those who don't wish to be blacklisted) will limit the number of > messages which can be sent per time unit and/or terminate accounts for > sending spam. A user on a compromised machine, though, wouldn't know > their system was blacklisted and probably wouldn't care. > > Just another way to help protect unsuspecting users from themselves. I don't need or want protecting from myself. I'll go to hell in my own way. :) -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140728205650.gc19...@copernicus.demon.co.uk
