Am having a problem with an MS Exchange server that I set up last month. Some domains - including hotmail - will not accept email from this exchange server. Cause will either be "Delivery delayed" or "SMTP relay denied. " Could anyone please assist - it's driving me nuts Thank you
Make sure open relay is not enabled on your Exchange server, and that you have a DNS PTR record to match your public IP A and MX records. You can check to see if you're being blacklisted by going to www.dnsstuff.com and doing a Spam Database Lookup using your Exchange server's public IP address. You can apply to be removed from most real-time blacklists (RBLs) as long as you have your DNS correctly set up and are very sure that you are not sending spam from your domain. To find out if a specific ISP or domain is blocking you, open a telnet session to their mail server on port 25 (you can get the MX record IP for any domain from DNSStuff). If you are being blocked you will likely see a message stating that your IP address is being blocked with a contact number or URL where you can apply for removal. I've just gone through the lengthy and frustrating process of removing our new office IP address from a number of RBLs and ISP blacklists. It turned out that our ISP has assigned us an IP block that had previously been blacklisted for open relay, so even if your Exchange server is secure and DNS is correct this is no guarantee that you're not being blocked. Keith W wrote in message news:d4957e3a-38c8-4b2d-8284-127044bd3cb7@f10g2000hsf.googlegroups.com... > Am having a problem with an MS Exchange server that I set up last > month. Some domains - including hotmail - will not accept email from > this exchange server. Cause will either be "Delivery delayed" or > "SMTP relay denied. " > > Could anyone please assist - it's driving me nuts > > Thank you
