Re: Suddenly Emails Bouncing

bill_at_yoder.org
Date: 10/19/05 

Date: 19 Oct 2005 13:39:43 -0700

I am seeing this too. I discovered this thread while searching for
reasons for this behavior.

It appears that Comcast has pissed off MSN. MSN is not accepting any
emails from Comcast's SMTP servers. I think this happened a couple of
years ago to AOL. Although, IIRC AOL was placed on a public blacklist,
and not just targeted by one provider.

I relay all my server's mail through Comcast's servers just to avoid
this problem.

Robert M. Riches Jr. wrote:
> I believe netiquette is that discussions that start in
> newsgroups should stay in the newsgroup. This has the
> advantage of allowing other readers to see solutions.
>
> On 2005-10-19, Marshall Lake <mlake@NS.mlake.net> wrote:
> > >> Suddenly within the past two or three days all emails I send to addresses
> > >> at msn.com and hotmail.com are bouncing with the error message "550
> > >> permit denied". Can anyone tell me why this might be happening?
> >
> > > What else does it say along with just the number? Is there
> > > something about the sending IP address being blacklisted?
> >
> > No, there's nothing else in the bounced error message.
>
> That's odd. I have always seen at least a little more
> detail about why the message bounced.
>
> > > Given that the blocklisters/blacklisters/snobs are firm in
> > > their misguided convictions that the way to beat spam is to
> > > prejudicially refuse direct email except from certain
> > > "blessed" hosts, the solution is you have to send through a
> > > "blessed" host. For a while, I used a Perl script I called
> > > "sendsnob" that would send email through my ISP's "outgoing"
> > > server. Later, when the number of snobs grew, I
> > > reconfigured postfix to use the transport table to route
> > > messages intended for certain destinations through the ISP's
> > > "blessed" outgoing server, using what I call a snob list.
> > > Another option is to configure your mail client (mutt can do
> > > this) to send through your ISP's "blessed" outgoing server.
> >
> > I run postfix. My home network uses dynamic IP addressing and is hung off
> > the comcast.net network. On my main mail server I have outgoing email
> > relayed through smtp.comcast.net. Emails sent from this machine are
> > suddenly encountering the "permit denied" errors when sent to addresses
> > at hotmail.com and msn.com. I tried sending email from another machine
> > in my home network where I do not relay outgoing email and the emails
> > went through fine.
>
> One solution/workaround might be to use the transport table
> to route messages depending on intended destination. Post
> back if you decide to try that but can't find enough
> documentation to figure out how.
>
> Somebody else posted something about your DNS entries having
> changed. That may be worth checking.
>
> > I had a problem years ago where my email was getting bounced and that's
> > when I started using comcast to relay my outgoing emails. Everything has
> > been fine until now.
> >
> > Anyway, I'd be interested in finding out more about identifying
> > "blessed hosts". Also, can I set postfix to relay through any host?
> > Would that host mind if I relayed my emails through them?
>
> Yes, but... Generally, the "blessed" host you should use is
> your ISP's outbound server.
>
> You can set postfix to relay through any host. However, the
> host you try to relay through will likely refuse. Open
> relays that will happily relay for anyone are severely
> frowned upon, because they will be abused by spammers and
> other low life. I would recommend against trying to use an
> open relay.
>
> Robert Riches
> spamtrap42@verizon.net
> (Yes, that is one of my email addresses.)

Relevant Pages

  • Re: Spam Problem
    ... I have checked the queues and I can see a handful of bogus emails - ... I have checked the relay settings, only the internal IP is listed in the ... submitting these emails to the queue - SMTP doesn't appear to show this? ... I can also scan all workstations from one ...
    (microsoft.public.windows.server.sbs)
  • Re: Lot of QUEUE in SMTP
    ... I saw the Relay seems to be ok there. ... -Right-click Default SMTP Virtual Server, ... > removing the anonymous authentication is a bad thing since people on ... >>recieve all the emails in hap hazard manner. ...
    (microsoft.public.exchange2000.general)
  • Re: Securing SMTP Relay
    ... Some emails will be discarded internally, a serious relay test site will ... you'll have to signup to get a proper report from it: ...
    (microsoft.public.inetserver.iis.smtp_nntp)
  • Re: Mail filtering with Exchange
    ... Neither Exchange nor any other email system I am aware of allows relay ... > I have a client who is running Small Business Server 2000, using Exchange ... > the emails, so it appears to come from user@my-company.com.au. ...
    (microsoft.public.backoffice.smallbiz2000)
  • Re: Reading Exchange 2003 SMTP Logs / Expected emails dont always arrive
    ... and it has nothing to do with Exchange itself (have spent a week on Exchange ... The issue appears to be as a result of an advanced option on our servers NIC ... As soon as I disabled the option, the emails from ... attachments, but I have checked the 'Message Delivery Option' defaults ...
    (microsoft.public.exchange.connectivity)