Re: [gentoo-user] Postfix receives OK, but won't send to internet
Neil Bothwick wrote: Unfortunately, quite a lot seem to do it. it's a lazy and lame "solution" to spam trojans. Other ISPs forward all port 25 connections to their own SMTP server, so your mail may not be delivered directly, but it is delivered. Having run a mail server from home, that's not the only problem to worry about any more - many ISPs/Mail Hosts now maintain (black)lists of IPs belonging to ADSL/Dial up Services (i.e. dynamically assigned IPs) which they'll refuse to accept e-mail from. So, if your ISP doesn't block traffic, you'll end up being caught out by that aswell! :( -- Jonathan Wright ~ mail at djnauk.co.uk ~ www.djnauk.co.uk -- 2.6.12-gentoo-r6-djnauk-b2 AMD Athlon(tm) XP 2100+ up 12:04, 4 users, load average: 4.46, 4.09, 3.68 -- "This is what's wrong with the media," I said. "You show a fringe position. You show one point of view. You're closing the minds of the people by not showing them what the reality is." I got up and walked out, and I've never been asked back again." "About a year ago I was a guest on a network news show in New York. They were showing film clips from a gay pride parade down Fifth Avenue, but they only decided to show the part with men in dresses and heels. I had seen the parade, and there were men in business suits as well. After showing the film, the newsperson made some comments, and I found the comments extremely offensive." ~ Kathleen Nolan -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Postfix receives OK, but won't send to internet
Neil Bothwick wrote: There is, redirecting port 25 traffic. I discovered an ISP was doing this by accident, when I switched to my backup ISP and forgot to change my mail settings. It was only later that I realised mail was still going out, despite my software being set to use a different ISP's server. So I sent myself a mail and checked the headers, they were redirecting all outgoing port 25 traffic to their own server. Hmmm that's not a bad plan, but I could some cases whee that might cause some issues. However overall it's probably better solution than just blocking port 25 access to anything, but your own servers. However back in '99 talking your dialup proviiders into tossing CPU eating ACL's onto their gear was hard enough let alone doing something complicated like hijacking smtp. I think even today it's hard to implement something like that unless you own most of the gear involved which isn't always the case. kashani -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Postfix receives OK, but won't send to internet
On Friday 23 September 2005 10:52, Dave Nebinger wrote: > John I'd suggest yahoo - they have a groups section where you can set up a > mailing list - they host the list, you just handle the posting. yeah, but they put ads at the bottom and you have no control over what is in the ad...I'm a bit of a control-freak that way. Eventually, I'll rewrite all this so it runs from our hosted web/ftp/mail space. -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Postfix receives OK, but won't send to internet
On Fri, 23 Sep 2005 10:20:50 -0500, kashani wrote: > I worked at probably the first nation wide US ISP to block port > 25 to any address other than our mail servers. While it was sad to see > the days of free and clear access to smtp dying there really wasn't > much choice. There is, redirecting port 25 traffic. I discovered an ISP was doing this by accident, when I switched to my backup ISP and forgot to change my mail settings. It was only later that I realised mail was still going out, despite my software being set to use a different ISP's server. So I sent myself a mail and checked the headers, they were redirecting all outgoing port 25 traffic to their own server. -- Neil Bothwick A day without sunshine is like night. pgpWQqABkl9rG.pgp Description: PGP signature
RE: [gentoo-user] Postfix receives OK, but won't send to internet
That would be the same problem; mailing lists still have to send mail from the originating host. John I’d suggest yahoo – they have a groups section where you can set up a mailing list – they host the list, you just handle the posting. A tad off-topic, but John, why don't you setup a mailing list and have the PTA members join? one unfortunately corollary to this is my isp doesn't block outgoing port 25, but DOES limit the number of emails you send via their relay. I send a newsletter for my kids' school's pta and I could not do that if I couldn't send at least a chunk of them directly.
Re: [gentoo-user] Postfix receives OK, but won't send to internet
Neil Bothwick wrote: Unfortunately, quite a lot seem to do it. it's a lazy and lame "solution" to spam trojans. Other ISPs forward all port 25 connections to their own SMTP server, so your mail may not be delivered directly, but it is delivered. Even if port 25 isn't blocked or redirected, it is often worth using your ISP's relay even if you have a broadband connection. Some ISP's block incoming mail from IP ranges allocated to broadband users as an anti-spam measure. I worked at probably the first nation wide US ISP to block port 25 to any address other than our mail servers. While it was sad to see the days of free and clear access to smtp dying there really wasn't much choice. Blocking outbound port 25 access did a fine job of stopping virus email that uses it's own stmp and spam hosts. While annoying to some users I don't think it's something you can really get around these days. Especially if you'd like to keep your IP space off trigger happy blacklists. However the above when implemented with port 25 inbound blocking sucks. We never did that. And I've seen ISP's require their domain in the From: line which breaks anyone's attempt at sending using their personal domain. We didn't do retarded things like that either. kashani -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Postfix receives OK, but won't send to internet
A tad off-topic, but John, why don't you setup a mailing list and have the PTA members join?On 9/23/05, John Jolet < [EMAIL PROTECTED]> wrote:On Sep 23, 2005, at 3:31 AM, Neil Bothwick wrote: > On Thu, 22 Sep 2005 22:38:07 -0400, Sean Lester wrote: That's it. I didn't think the ISP would block outgoing port 25. Unfortunately, quite a lot seem to do it. it's a lazy and lame > "solution"> to spam trojans. Other ISPs forward all port 25 connections to> their own> SMTP server, so your mail may not be delivered directly, but it is> delivered.> > Even if port 25 isn't blocked or redirected, it is often worth> using your> ISP's relay even if you have a broadband connection. Some ISP's block> incoming mail from IP ranges allocated to broadband users as an > anti-spam> measure.>one unfortunately corollary to this is my isp doesn't block outgoingport 25, but DOES limit the number of emails you send via theirrelay. I send a newsletter for my kids' school's pta and I could not do that if I couldn't send at least a chunk of them directly.--gentoo-user@gentoo.org mailing list-- - Mark Shields
Re: [gentoo-user] Postfix receives OK, but won't send to internet
On Sep 23, 2005, at 3:31 AM, Neil Bothwick wrote: On Thu, 22 Sep 2005 22:38:07 -0400, Sean Lester wrote: That's it. I didn't think the ISP would block outgoing port 25. Unfortunately, quite a lot seem to do it. it's a lazy and lame "solution" to spam trojans. Other ISPs forward all port 25 connections to their own SMTP server, so your mail may not be delivered directly, but it is delivered. Even if port 25 isn't blocked or redirected, it is often worth using your ISP's relay even if you have a broadband connection. Some ISP's block incoming mail from IP ranges allocated to broadband users as an anti-spam measure. one unfortunately corollary to this is my isp doesn't block outgoing port 25, but DOES limit the number of emails you send via their relay. I send a newsletter for my kids' school's pta and I could not do that if I couldn't send at least a chunk of them directly. -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Postfix receives OK, but won't send to internet
On Thu, 22 Sep 2005 22:38:07 -0400, Sean Lester wrote: > That's it. I didn't think the ISP would block outgoing port 25. Unfortunately, quite a lot seem to do it. it's a lazy and lame "solution" to spam trojans. Other ISPs forward all port 25 connections to their own SMTP server, so your mail may not be delivered directly, but it is delivered. Even if port 25 isn't blocked or redirected, it is often worth using your ISP's relay even if you have a broadband connection. Some ISP's block incoming mail from IP ranges allocated to broadband users as an anti-spam measure. -- Neil Bothwick Knock firmly but softly. I like soft firm knockers. pgpNAJYiUbTEZ.pgp Description: PGP signature
RE: [gentoo-user] Postfix receives OK, but won't send to internet
That's it. I didn't think the ISP would block outgoing port 25. Thanks to all that responded. Sean -Original Message- From: Bryan Whitehead [mailto:[EMAIL PROTECTED] Sent: Thursday, September 22, 2005 5:00 PM To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Postfix receives OK, but won't send to internet Many ISP's route all outgoing port 25 traffic to a black hole (as in they drop the packets not going to their smtp servers). You just need to configure postfix to push all your mail to your ISP's mail server. On Thu, 22 Sep 2005, Sean Lester wrote: > Greetings, > I have a partially working Postfix installation. It delivers > messages on the localhost. It'll receive messages from the internet. > But, it will not send messages to any hosts on the internet. I've > checked my iptables and port 25 is open both ways. Also, each error > I've gotten has been that the target smtp server has "Timed Out." Can > anyone point me in the right direction? Postfix? Firewall? Host or > Domain Name resolution? Other? > > Thank you for your time. > > Sean > > -- Bryan Whitehead Email:[EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Postfix receives OK, but won't send to internet
Many ISP's route all outgoing port 25 traffic to a black hole (as in they drop the packets not going to their smtp servers). You just need to configure postfix to push all your mail to your ISP's mail server. On Thu, 22 Sep 2005, Sean Lester wrote: Greetings, I have a partially working Postfix installation. It delivers messages on the localhost. It'll receive messages from the internet. But, it will not send messages to any hosts on the internet. I've checked my iptables and port 25 is open both ways. Also, each error I've gotten has been that the target smtp server has "Timed Out." Can anyone point me in the right direction? Postfix? Firewall? Host or Domain Name resolution? Other? Thank you for your time. Sean -- Bryan Whitehead Email:[EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Postfix receives OK, but won't send to internet
On Thu, Sep 22, 2005 at 04:06:34PM -0400, Sean Lester wrote: > Greetings, > I have a partially working Postfix installation. It delivers > messages on the localhost. It'll receive messages from the internet. > But, it will not send messages to any hosts on the internet. I've > checked my iptables and port 25 is open both ways. Also, each error > I've gotten has been that the target smtp server has "Timed Out." Can > anyone point me in the right direction? Postfix? Firewall? Host or > Domain Name resolution? Other? > What is your setup like? Is the smtp time out happening between client and postfix, or between postfix and a relay host? If the problem is that your mail client cannot send mail through postfix, check /etc/postfix/main.cf, a few variables of interest might be inet_interfaces, my_destination, mynetworks_style, etc. If the problem is between postfix and a relay host, perhaps your relay transport is configured wrong? What are the outputs in /var/log/mail/current after you try to send a mail? (That question only applies if you know the problem happens AFTER the mail gets passed from the client to postfix). W -- I couldn't repair your brakes, so I made your horn louder. Sortir en Pantoufles: up 41 days, 23:47 -- gentoo-user@gentoo.org mailing list
RE: [gentoo-user] Postfix receives OK, but won't send to internet
Title: Message Your ISP may be blocking port 25 outside of their own network. Most likely you need to configure postfix to relay mail through your ISP’s mail server rather than just use your own. A lot of ISP’s do this so they don’t have to handle complaints about spam originating from one of their users. -Original Message- From: Sean Lester [mailto:[EMAIL PROTECTED] Sent: Thursday, September 22, 2005 4:07 PM To: gentoo-user@lists.gentoo.org Subject: [gentoo-user] Postfix receives OK, but won't send to internet Greetings, I have a partially working Postfix installation. It delivers messages on the localhost. It'll receive messages from the internet. But, it will not send messages to any hosts on the internet. I've checked my iptables and port 25 is open both ways. Also, each error I've gotten has been that the target smtp server has "Timed Out." Can anyone point me in the right direction? Postfix? Firewall? Host or Domain Name resolution? Other? Thank you for your time. Sean
Re: [gentoo-user] Postfix receives OK, but won't send to internet
On Sep 22, 2005, at 3:06 PM, Sean Lester wrote: Greetings, I have a partially working Postfix installation. It delivers messages on the localhost. It'll receive messages from the internet. But, it will not send messages to any hosts on the internet. I've checked my iptables and port 25 is open both ways. Also, each error I've gotten has been that the target smtp server has "Timed Out." Can anyone point me in the right direction? Postfix? Firewall? Host or Domain Name resolution? Other? Thank you for your time. Sean at the command line, get the name of one of the servers that's timed out. type "telnet servername 25" and see what happens. maybe post a snippet from the maillog before and after the timeout message.
