Bacula-users

Re: [Bacula-users] thannyd earthlink.net

2009-04-07 07:24:02
Subject: Re: [Bacula-users] thannyd earthlink.net
From: Kevin Keane <subscription AT kkeane DOT com>
Date: Tue, 7 Apr 2009 04:19:27 -0700
Chris Hoogendyk wrote:
> Mike Holden wrote:
>   
>> Eric J. Wisti wrote:
>>   
>>     
>>> That still doesn't make the "Please verify" messages any more friendly.
>>> What if someone forges my email address and sends you a spam. I get a
>>> "Please verify" message, but I had nothing to do with the email that was
>>> sent, other than being a victim of an email forgery. Now, I also get a
>>> nice "Please Verify" message. These systems may have been a ok workaround
>>> before, but now that spam is some 94% of email is spam, all it does is
>>> increase the amount of "spam", and involve people who may not even be
>>> connected with the emails you receive.
>>>     
>>>       
>> Welcome to the 2009 internet mate! We're all fed up of spam, but until the
>> ISPs get their fingers out collectively and block junk at source, we're
>> stuck with it.
>>
>> If someone forges your email address to send spam, then you will still get
>> any bounces back anyway if the victim email addresses fail (unknown email
>> address, quota exceeded etc). A fair percentage of the spam I receive is
>> bounce messages from spam sent "on my behalf" (i.e. spoofed From address)
>> to invalid email addresses.
>>   
>>     
>
> I grant you that a lot of improperly configured mail servers will create 
> such bounce back. However, a properly configured mail server won't 
> accept that email in the first place. It will get a message back to the 
> connecting "server" indicating "unknown email address" or whatever, 
> rather than accept the message and end up having to reply back to a 
> potentially forged return address.
>   
Unfortunately, it's not that easy. There are two (somewhat) legitimate 
reasons why many mail servers are configured the way you describe as 
"improperly configured".

One is that the mail server may be Microsoft Exchange. Exchange will 
always accept emails to the locally hosted domain, and only at a later 
stage of processing determine whether it is deliverable or not. It may 
well be a misfeature of Exchange, but given how popular it is as a mail 
server, it's hard to argue that they are all "improperly configured".

The second reason is that you may have some kind of front-end relay 
server that simply does not know all the recipients on the final server.

That said, I, too, find these "please verify" messages exceedingly rude; 
I usually tend to instead not communicate with that person.

Fortunately, it seems that these "please verify" messages are mostly a 
thing of the 1999 Internet. This discussion is the first time I have 
seen it still being alive in a very long time.

-- 
Kevin Keane
Owner
The NetTech
Find the Uncommon: Expert Solutions for a Network You Never Have to Think About

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