On Sat, Jul 21, 2001 at 02:17:36PM -0700, Sean Chittenden wrote:
> Delivered-To: freebsd-security@freebsd.org > Date: Sat, 21 Jul 2001 14:17:36 -0700
Well don't I feel like forest gump... sorry about being late to
the party folks, my ISP's reverse DNS hit the shiznits earlier today and
all of its outbound email to hubs (or any mail server that did reverse
lookups) was a tad slow to be accepted. This is pretty OT at this
point, but I'd like to question the value of reverse DNS lookups for
mail hosts. SPAM prevention? Hardly any benefit these days... -sc
--
Sean Chittenden
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Re: Scared as hell with SBS 2003 Exchange ... public outside IP address and forwarding them to the outside interface of a Symantec Gateway Security 360 appliance, forwarding those same ports to SBS 2003's internal IP address. ... This same person told me I need to put the Exchange server on the PIX 501 DMZ interface and use a different public IP address just for Exchange. ... I've heard that I need to set up reverse DNS for my public IP address to allow messages being sent to certain domains such as verizon.net, nyc.rr.com, optonline.net, etc. I'm getting messages as follows: ... or send mail through your ISP's own mail server... (microsoft.public.windows.server.sbs)
Re: Changed Internet Service and Now Having E-mail Problems ... I can telnet to your mail server using either the ip address or the domain name as shown in the mx records that are listed in the report. ...FAIL Reverse DNS entries for MX records ERROR: The IP of one or more of your mail serverhave no reverse DNS entries/* */. ... It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry. ... You can double-check using the 'Reverse DNS Lookup' tool at the DNSstuff site if you recently changed your reverse DNS entry (it contacts your servers in real time; the reverse DNS lookups in the DNS report use our local caching DNS server). ... (microsoft.public.windows.server.sbs)
Cannot send email to hotmail.com !?!? ... are stuck on retry and are unable to get the mail delivered. ...mail server, but the reverse DNS entries are now fine and still ... (microsoft.public.exchange.admin)
Re: An SMTP protocol error occurred when sending to AOL and Compuserve ... correct reverse DNS registration for your sending mail server... firewall settings - cisco PIX firewalls with DNS Fixup enabled can only ... This is too small for AOL... > verified our reverse DNS entries; and I did their telnet test that shows ... (microsoft.public.exchange2000.admin)
Re: Reverse DNS/PTR ... What is PTR and what is that for? ... What are the differences between forward DNS and reverse DNS?... pretending to be another reliable mail server;... Hope my explanation was clear enough. ... (microsoft.public.windows.server.dns)
