nanog mailing list archives
Re: ingress SMTP
From: Matthew Moyle-Croft <mmc () internode com au>
Date: Sat, 13 Sep 2008 15:11:02 +0930
Hi Bill, Bill Stewart wrote:
Except that this tends to lead to a worse situation for people like yourself who wish to run a mailserver - because ultimately you'll have to resort to using an ISP's forwarder anyway because there will be more spam from the IP ranges you're in leaving to the wide world, thus a worse reputation, and so more blocking. ie. by blocking outbound SMTP by default and getting customers to use our mail cluster their email is more likely to arrive and not be dropped as coming from a potential spam source.In some sense, anything positive you an accomplish by blocking Port 25 you can also accomplish by leaving the port open and advertising the IP address on one of the dynamic / home broadband / etc. block lists, which leaves recipients free to whitelist or blacklist your users.
That's what we do - by default most customers have a small ACL applied which protects them from traffic from various windows ports, ensures SMTP goes via our mail cluster etc. Having customers send mail out via us is actually better because we do spam checking and can alert customers to their machines being compromised etc (or at least customers can look at their status themselves). But, customers can easily turn the filtering off via the portal we have.I've toned down my vehemence about the blocking issue a bit - there's enough zombieware out there that I don't object strongly to an ISP that has it blocked by default but makes it easy for humans to enable.
We have no issues with customers running servers - most people don't, and those who do value the ability to do so.
MMC -- Matthew Moyle-Croft - Internode/Agile - Networks Level 4, 150 Grenfell Street, Adelaide, SA 5000 Australia Email: mmc () internode com au Web: http://www.on.net Direct: +61-8-8228-2909 Mobile: +61-419-900-366 Reception: +61-8-8228-2999 Fax: +61-8-8235-6909
Current thread:
- Re: ingress SMTP, (continued)
- Re: ingress SMTP Jay R. Ashworth (Sep 03)
- Re: ingress SMTP Nicholas Suan (Sep 03)
- Re: ingress SMTP Jay R. Ashworth (Sep 03)
- Re: ingress SMTP Valdis . Kletnieks (Sep 03)
- Re: ingress SMTP Tony Finch (Sep 04)
- Re: ingress SMTP David Champion (Sep 04)
- Re: ingress SMTP Joel Jaeggli (Sep 10)
- Re: ingress SMTP Robert E. Seastrom (Sep 11)
- Re: ingress SMTP Bill Stewart (Sep 12)
- Re: ingress SMTP Mark Foster (Sep 12)
- Re: ingress SMTP Matthew Moyle-Croft (Sep 12)
- RE: ingress SMTP Frank Bulk (Sep 13)
- Re: ingress SMTP Matthew Moyle-Croft (Sep 13)
- Re: ingress SMTP Suresh Ramasubramanian (Sep 13)
- RE: ingress SMTP Frank Bulk (Sep 13)
- Re: ingress SMTP Alec Berry (Sep 03)
- Re: ingress SMTP Stephen Sprunk (Sep 03)
- Re: ingress SMTP Simon Waters (Sep 03)
- Re: ingress SMTP Justin Scott (Sep 03)
- Re: ingress SMTP Suresh Ramasubramanian (Sep 03)