On Sat, 24 Jan 2004 18:31, Yuri de Groot wrote: > On Fri, 23 Jan 2004 22:56, you wrote: > > > I have had this rejected a number of times by the receiver as I have no > > > reverse lookup for my smtp server as it is on a Dyn DNS setup. > > > > It's irrelevant whether it's on dyndns or not. Relevant is whether the > > IP you are using has any reverse lookup at all. This is usually, but not, always correct. There are some spam filters in use which demand that the forward and reverse dns lookups correspond.
> If the ISP you're using > > at the time doesn't have reverse lookup configured for your allocated > > IP, you're in trouble. Dyndns only provides a name->IP mapping, but not > > the reverse. My cable IP has reverse lookup and as far as I can tell, I > > never had a problem sending email via smtp directly, dyndns or not. > > Yep. If your dial-in/cable/adsl provider assigns you the ip address > 123.1.2.3 for the session, then you will have a hostname like: > 123-1-2-3.dialup.isp.co.nz > or > 123-1-2-3.cable.paradise.net.nz These are fixed addresses. $ host 202-0-37-152.cable.paradise.net.nz 202-0-37-152.cable.paradise.net.nz has address 202.0.37.152 Complete with reverse look-up $ host 202.0.37.152 152.37.0.202.in-addr.arpa domain name pointer 202-0-37-152.cable.paradise.net.nz I understand Paradise will give cable ppl. a Paradise subdomain address. At what cost I have yet to determine. > for example, right now, a reverse look-up on the IP I'm posting from would > resolve to 218-101-92-110.dialup.clear.net.nz, although this will be > different next time I dial in. > > AFAIK all major ISPs do this. YMMV -- Sincerely etc. Christopher Sawtell NB. This PC runs Linux. If you find a virus apparently from me, it has forged the e-mail headers on someone else's machine. Please do not notify me when this occurs. Thanks.
