|
Email is sent through what are called envelopes. This is specific to MS<->MS (MS = Mail Server) communication When an email comes in the MS opens the envelope and then the MS reads the headers and determines if there is an account and… This envelope is unseen the mail client. At the start of the MS<->MS communication is a SMTP connection from an IP address. That IP Address is Reverse DNS’d (Reverse DNS is simply getting the Domain Name based on IP Address) And matched to the Mail Server (Forward) DNS MX and if the 2 IP addresses don’t match or there is no reverse DNS MX record (in DNS servers there are MX records; MX = Mail Exchange) the MX records separate your mail server from your web server this is how you can have Web and Email on the same domain.
So, If you are sending email through a server relay and claiming to be from XYZ domain and the Reverse DNS MX say that IP belongs to ABC domain. The whole SMTP communication between MS’s can be blocked prior to any further waste of the mail server’s time.
As for the The return-address not matching the domain name: this is one check a mail server can filter on but it is unreliable because it can be spoofed.
I hope this helps J
Ben Johansen - http://www.pcforge.com -----Original Message-----
I'll start by stating that I am not experienced when it comes to running mail servers and dns (although I do understand the basics). Forgive the stupid question but what do you mean by "...are using mail resources that are not registered and traceable..."?
Does this mean that if I send mail with a return address that doesn't match the domain name of the mailserver that it goes out from that it is considered to be not registered?
Please let me know.
Thanks,
Steve Smith
|
<<image001.jpg>>
________________________________________________________________________ TO UNSUBSCRIBE: Go to http://www.witango.com/maillist.taf
