Steve Poe a écrit :
I am new to email servers, so pardon my ignorance.
The small company I work for has an email server where they want
to create an approved/whitelist for emails coming from the outside.
For example,
I email [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>. the abc.com
<http://abc.com> mailserver does not see my email
address in approved list for the user account and/or as a company-wide
contact list, so the abc.com <http://abc.com> mail server sends a
reply to me to confirm I sent
the email that I *really* wanted to send the email to [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>. Meanwhile,
John receives my email, after confirmation of my response, then he adds me
to his personal contact/approved list. The mail administrator found
out that I am
a new client of abc.com <http://abc.com> so I am added to the
company-wide approved list.
We are running Courier 0.53 on Centos Linux 4.4
Is this possible?
Thanks for your help.
Thanks.
Steve
Hello,
Just imagine:
1/ Quiet day today, no mails:
- your server use such a challenge question...
- the remote server requires such challenge question too...
If you don't want to enter in a nice deadlock, you will have to add the
first recipient to the whitelist. If you don't do it automatically, it
would mean that your colleagues will have to add them manually... Don't
count on it ! So, you will have to add automatically all recipients you
are trying to reach, including all typos, all spams you could send due
to an infection...
More over, sending challenge question is the best practice to never
receive mail automatically generated. Even if the return address is
valid, you will never be sure it's read ! You will never get the answer
! Bye bye, bills, receipts, invoices...
2/ We love all the world:
- I spam your server with forged addresses
- YOU will be blacklisted all around the world. YOU will have to pay
fees to get removed from SORBS...
Do you really want to loose mail, customers and money?
If your goal is to fight against spam, use greylisting + spamassassin.
HTH.
Jerome Blion.
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