Block outgoing mail w/ bad addressing

[Ken A]

Jethro R Binks wrote:
> On Wed, 18 Oct 2006, Ken A wrote:
> 
>>> *	Check to see if the message has been addressed with an improper
>>> email domain (username at maildomain .com instead of maildomain.net, etc)
>> Yeah, our users have fatter fingers than your users! You can do this in
>> sendmail access map. Postfix has something similar, I'm sure..
> 
> Why on earth are you trying to implement a technical solution to this 
> problem?
> 
>> To:sbcgobal.com        ERROR:5.1.1:550 Please check spelling on recipient
>> domain - should be sbcglobal.net
> 
> What if you really need to mail sbcgobal.com or maildomain.com some day?  
> Either you can't, or you take this rule away again, in which case your 
> problem comes back.

That could happen, I agree, but most likely typo domains are owned by 
typosquatters or worse, phishers and are in one or more uri blacklists 
(sbcgobal.com is). They may well be using mail sent to them to build 
spam lists. It's just a tool, call it a crowbar if you like. I don't do 
this with any legitimate domains.

Ken A.
Pacific.Net

> This is a user education issue, not a "crow-bar in any inappropriate fix 
> to compensate for naiive or careless users".
> 
> At least you could give them an address book, then they don't need to 
> (mis)type anything.
> 
> Jethro.
> 
> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> Jethro R Binks
> Computing Officer, IT Services
> University Of Strathclyde, Glasgow, UK