Postfix Address Verification

[Scott Silva]

Jody Cleveland spake the following on 6/27/2007 9:42 AM:
> 
> 
> On 6/26/07 2:57 AM, "Gareth" <list-mailscanner at linguaphone.com> wrote:
> 
>> See
>> http://www.mailscanner.info/wiki/doku.php?id=documentation:configuration:mta:p
>> ostfix:how_to:reject_non_existent_users
>> Thats what I do and it works very well.
>>
>> Just make sure Exchange is configured to reject mail to unknown
>> recipients. If you cant do that then there are other ways such as using
>> LDAP to regularly pull out a list of valid addresses from exchange,
> 
> So, just so I'm clear, (we're using Exchange 2003) it will work if I add
> this (taken from the link you sent):
> 
> 1) Confirm that master.cf contains the following line and add it if not:
> 
> verify unix - - n - 1 verify
> 
> 2) Add the following to main.cf
> 
> In smtpd_recipient_restrictions add the following options:
> 
> reject_unknown_recipient_domain, reject_unverified_recipient
> 
> Then add the following options:
> 
> unverified_recipient_reject_code = 550
> address_verify_map = btree:/etc/postfix/verify
> 
> 3) Restart postfix and test functionality
> 
> The problem is, I need to be able to do this without using ldap, and I can't
> change any settings on the exchange server itself. (it's under someone
> else's control)
> 
> - jody
> 
The Exchange server has to be set to only accept valid e-mail. I am not sure
if it is a default setting. Looking at Microsofts track record of backward
compatibility, it probably is not the default.

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