Re: Have all the Email systems of the world been broken by ISP's SPAM filters?
From: Lanwench [MVP - Exchange] (lanwench_at_heybuddy.donotsendme.unsolicitedmail.atyahoo.com)
Date: 01/02/05
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Date: Sun, 2 Jan 2005 13:13:56 -0500
BeamGuy wrote:
> I am sitting here in this new year trying to figure out how on earth
> I am supposed to send email to my in-laws this year. Their email
> stopped working a few weeks back when their ISP installed a new SPAM
> filter. Now it is fixed... but only 2/5 of my test messages get
> through.
>
> Searching Google I find that they are not alone. There are not only
> ample complaints about their own tiny ISP.
>
> And their ISP is not alone either. Several months back a friend had
> to give up sending mail to my home DSL account because her messages
> were bouncing... - Google has huge numbers of complaints about my own
> Verizon DSL provider as well.
>
> Here is my matrix of what does not work.
>
> Verizon.net CANNOT send mail to worldkey.net
> axcelis.com CANNOT send mail to worldkey.net
> princeton.edu CANNOT send mail to worldkey.net
> netzero.com CAN send mail to worldkey.net
> samus.securehbs.com CAN send mail to worldkey.net
>
> worldkey.net CANNOT send mail to verizon.net
> worldkey.net CAN send mail to samus.securehbs.com
> worldkey.net CAN send mail to princeton.edu
> worldkey.net CAN send mail to netzero.net
> worldkey.net CAN send mail to axcelis.com
>
> comcast.net sometimes CANNOT send mail to verizon.net
> verizon.net CAN send mail to comcast.net
>
> samus.securehbs.com CANNOT send mail to godaddy.com for forwarding
> either... In this case they were nice
> enough to send back this response:
> "smtp.secureserver.net [64.202.166.12]: 553 69.93.45.234 rejected due
> to spam, contact 480-505-8877 (Attack detected)"
>
>
> -------------
>
> It is not my job to fill in the rest of the matrix. It looks like as
> many as 50% of the relays
> from one mail to another mail server are broken! Please tell me this
> is not happening.
> I make a living making parts for computers.... if you guys in the
> interest of security break
> everyone's confidence that email will get through... well everyone
> will switch back to
> paper mail and leave all of us with rusty expensive toys that no one
> uses anymore!
I'd presume NDRs would be generated if all is working as it should be- that
can provide a clue. SMTP servers are supposed to send NDRs - it isn't good
practice to disable this.
The sender should contact his/her ISP as well as the recipient's. Spam
filtering can be a great thing, but if the settings are too severe, there
will be a lot of false positives. Also, a lot of mail servers block mail
from specific domains, or dynamic IP address ranges, etc -
I don't like server-side spam filtering that doesn't allow the users access
to a quarantine folder.
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