When you send mail, it travels across the internet like this:
your SMTP server -> recipient's SMTP server -> recipient's IMAP/POP/Webmail server-> recipient's home computer.
Your SMTP server is usually operated by whoever owns the computer with the domain name that matches what comes after the @ symbol in your email address. So, if your email address is fake@gmail.com, then your SMTP server is owned by gmail. The same goes for your recipient's SMTP server.
The error message indicates that the recipient's SMTP server thinks that your SMTP server is evil. An RBL is a "Real-time Black-hole List". These are frequently updated lists of machines that are "known" to send spam and are therefore banned from sending to the machines that use the RBL. These lists were extremely popular in the late 1990s and early 2000s, but have gone out of fashion due to several scandals involving steep payments from alleged offenders who arguably didn't do anything wrong - blackmail. Even today, the method by which these RBLs detect offenders is sketchy.
You'll notice that the IP address of that machine that was blocked is now no longer blocked by the RBL:
http://www.spamcop.net/w3m?action=checkblock&ip=216.200.145.36
More information about black-hole lists:
http://en.wikipedia.org/wiki/DNSBL
--David
On 08/25/2011 04:18 PM, vincentwinterling wrote:
>
> I'm not familiar with that particular error message but googling the error brings up many hits. The top few seem like they could, at the very least, provide you with information that you could pursue with the IT folks at your location. If this is a personal ISP issue, I would talk to them first to determine how to remedy your issue.
>
> --- In simplycomputers2@yahoogroups.com <mailto:simplycomputers2%40yahoogroups.com>, Joan Leach <jleach728@...> wrote:
> >
> > Universities are pretty locked down. Either go to the regular website, or use their passwords from the email account they supplied you. If you want a listing of their classes it might be in a pdf file.
> >
> > Good luck,
> > Joan in Reno
> >
> > --- On Thu, 8/25/11, likwanlap <likanlap@...> wrote:
> >
> > From: likwanlap <likwanlap@...>
> > Subject: [Simply Computers] Rebounded Mail
> > To: simplycomputers2@yahoogroups.com <mailto:simplycomputers2%40yahoogroups.com>
> > Date: Thursday, August 25, 2011, 10:30 AM
>
> > I tried to send a message to an email address, as follows: courses@...
> >
> >
> >
> > I got a rebounded notification:
> >
> >
> >
> > ----- The following addresses had permanent fatal errors -----
> >
> > <courses@...>
> >
> > (reason: 550-Your IP address is on the RBL blacklist! Sending denied. )
> >
> >
> >
> > ----- Transcript of session follows -----
> >
> > ... while talking to mail.commsupport.co.uk.:
> >
> > <<< 550-Your IP address is on the RBL blacklist! Sending denied.
> >
> > <<< 550-For further information and delisting procedure,
> >
> > <<< 550 please see http://www.spamcop.net/w3m?action=checkblock&ip=216.200.145.36 <http://www.spamcop.net/w3m?action=checkblock&ip=216.200.145.36>
> >
> > 554 5.0.0 Service unavailable
> >
> >
> >
> > What is a "RBL blacklist", and can somebody tell me what this message means, or why my attempt to send it failed
> >
> >
> >
> > Thanks
> >
> > Andre Li
>
>
[Non-text portions of this message have been removed]
http://tech.groups.yahoo.com/group/simplycomputers2
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