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[SOLVED] Which IP('s) of message will be blacklisted?
Posted: Tue Jul 31, 2007 4:10 pm
by gzox
Dear I am not expert for sending the messages. I have a question:
I plan to have a web mail service. Client could send messages from his browser. It will bi done with swift.
First, I am interested will the message that clients sends would have a clients IP?
Second, which IP's also will have the mesage (IP of SMTP server...) in headers?
And on end, which of all that IP's will be used for blacklisting of message (example on cbl.abuseat.org or
http://www.abuse.net...) if someone want to black list message?
Does the blacklists block the smtp servers IP's, or clients IP's...?
I hope that you can understand me. Thank you in advance.
Posted: Tue Jul 31, 2007 6:27 pm
by Chris Corbyn
Unless I'm misunderstanding you, are you saying that you're planning on creating a relay server?
Any server the mail passes through could be blacklisted. If you're worried about spam you should run your own checks against the IP the client connects from. Any server the message passes through MUST append its IP/HELO information along with the connecting client's IP to the message headers. Effectively, when you receive an email, unless malicious software was used at some point you will know exactly where it's been.
Posted: Tue Jul 31, 2007 7:13 pm
by gzox
I am not sure what mean relay server. But I am think that I am not do that, because I will use the ISP smtp server to send email's, if you mean on that.
Any server the mail passes through could be blacklisted.
It is clear.
How black list work more? It does on IP of smtp server, as I understand.
But I am not understand jet, does it work on IP of client which send email width some smtp server?
It is important form me to know that. Some of my partners don't want emails from my clients, because they afraid for spam. But every message or my clients I plan to check manually and then I would ask client to send the message from his browser. The business is legal and not a spam. But I want only to be sure that my partners would not block my messages because they arrive from same client sender (me - if I send messages directly, not my clients). Because of that I want to my clients send messages, and ask: Does the blacklists services work on and IP of client which send email width some smtp server?
I hope that you can understand this.

Posted: Wed Aug 01, 2007 3:09 am
by Chris Corbyn
gzox wrote:I am not sure what mean relay server. But I am think that I am not do that, because I will use the ISP smtp server to send email's, if you mean on that.
I mean are you opening a service to allow other people to send any email they want through it? This carries many risks.
gzox wrote:Any server the mail passes through could be blacklisted.
It is clear.
How black list work more? It does on IP of smtp server, as I understand.
But I am not understand jet, does it work on IP of client which send email width some smtp server?
It is important form me to know that. Some of my partners don't want emails from my clients, because they afraid for spam. But every message or my clients I plan to check manually and then I would ask client to send the message from his browser. The business is legal and not a spam. But I want only to be sure that my partners would not block my messages because they arrive from same client sender (me - if I send messages directly, not my clients). Because of that I want to my clients send messages, and ask: Does the blacklists services work on and IP of client which send email width some smtp server?
I hope that you can understand this.

Yes, it can effectively work on the IP of the client because each time the message gets relayed to another server, the SMTP server then becomes a client itself. Either way, if you're always using the same SMTP server that server could also end up in a blacklist, though it's very difficult for large ISPs to be blacklisted anyway.
Posted: Wed Aug 01, 2007 8:41 am
by gzox
Thank you very much. It is all for now.
Thank you!
Zoran.