I've posted a couple of questions about this before. We have a company in the UK with which we need to exchange e-mail. We can receive mail from them just fine. However, any e-mail addressed to them from within our network will fail.
We have checked the following items: -Reverse DNS look-up... our isp has set up reverse DNS records to our mail server and the company in the UK verifies that they can see them. -check for blacklisting or blockin... the isp in the UK claims that they are not blocking any of our ip's. They use SpamCop for their blacklist and we are not listed by SpamCop. -We are capable of reaching our intended recipient if we send from anywhere except our network. I can reach them via AOL; I can reach them using a dial-up connection that bypasses our router. The "break-down" seems to occur once I get behind the Cisco router that our isp has put on-site to connect us to the T-1. My isp denies that there router could be the problem. They feel that if it were there router, then ALL SMTP traffic would be affected, not just one particular domain/ip. I don't really think this forum is the proper place to address this issue any further. But I could use some recommendations as to a good place to seek help. BOTH isp's are being very apathetic about this. Each says it must be something wrong with the other isp. I keep going round and round with them and getting nowhere. I'm sure there must be some test... some way of determining what is causing the "blockage". I'm looking for either a newsgroup or tech support list that would be appropriate to address this issue. Or if you know of a network "tool" that would allow me to test the connections and determine what the source of the block is, I'd be grateful. TIA, ================================================ | Doug Starkey | | Network Administrator | | Pecan Deluxe Candy Company | | 2570 Lone Star Drive | | Dallas, TX 75212-6308 | | e-mail: [EMAIL PROTECTED] | | voice: 214-631-3669 Ext. 108 | | fax: 214-631-5833 | ================================================ ############################################################# This message is sent to you because you are subscribed to the mailing list <[EMAIL PROTECTED]>. To unsubscribe, E-mail to: <[EMAIL PROTECTED]> To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> To switch to the INDEX mode, E-mail to <[EMAIL PROTECTED]> Send administrative queries to <[EMAIL PROTECTED]>
