Webone blocking port 25??
kim.holburn at anu.edu.au
Thu Jul 25 12:03:50 EST 2002
At 10:52 AM +1000 2002/07/25, Paul Bryan wrote:
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>I was just wondering why you might not use your ISP's mail relay?
You want to send mail from another account. Tying your email to an ISP doesn't necessarily make any sense. I usually don't bother with the "free" email accounts I get with ISPs. Especially if you travel a lot or want to keep a single email address at home and work. WebOne's and most ISP's email servers will only accept mail from a local account and usually authenticate by IP, so you can't send mail when you're not logged in at home. That's just ridiculous these days. It's just too complicated changing email addresses constantly. Might help with the spam problem I guess.
>I use my IPS's relay because any mails gonna' go through their network
>anyway, might as well get the ISP's relay to do all the dirty work of
>figuring out where the mails going and handling the transmission and so
>Is there any reason why this might be bad for a home user (aside from the
>obvious, like when the mail relay is down)?
>It seemed to me the best way to do things. They've got the relay sitting
>there happy to send on my mail - might as well use it.
>On Thu, 25 Jul 2002 10:19, Stuart Watson wrote:
>> On 25/07/2002 at 9:41 AM Alex Satrapa wrote:
>> >On Thursday, July 25, 2002, at 12:13 , David Clarke wrote:
>> >> Not sure that they'll fix it, I emailed them about it and got an
>> >> back about it being in place to stop something from happening....
>> >Any ISP worth their salt *should* block port 25 outgoing, and
>> >clients to send mail through the ISP's relay. Mainly to prevent
>> >Microsoft Outlook being used as a viral proliferator. There's also
>> >advantage of having a virus scanner being run over your mail inbound
>> Another reason for ISPs to block 25 is poorly configured
>> wingate/proxy/linux/nt/whatever machines that act as open relays.
>> Many of you have probably seen the mess a dial up connection can do
>> as a relay - just imagine a 1mbit connection.
>> >I'm of split minds as to whether it would be reasonable to expect
>> >ISP to poke holes in their firewall for clients who ask. After all
>> >all it takes is for one virus to get into your only Windows box, and
>> >you've just become part of the problem.
>> It comes down to how prepared the ISP is to do custom configurations
>> on a per user basis, on a large scale setup where multiple systems
>> have a streamline configuration, admins will probably cringe at the
>> idea of messing around with rules/conf for a few users. However
>> smaller operations will probably have no problem with a quick
>> iptables -I.
>> I guess this is where the real distinction between a "home" and a
> > "business" connection come into play - business connections are
> > really for people who have the need to run their own internal mail
> > servers and so forth and are 'untouched' connections usually w/ perm
>> IPs, faster speeds for this reason.
>E-Mail: pa_bryan at yahoo.co.uk
>"The pathology is to want control, not that you ever get it, because of
>course you never do."
>- -- Gregory Bateson
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Kim Holburn Network Consultant P: +61 2 61258620 M: +61 0417820641
Email: kim.holburn at anu.edu.au - PGP Public Key on request
Life is complex - It has real and imaginary parts.
Andrea Leistra (rec.arts.sf.written.Robert-jordan)
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