Re: A simple script to update dynamic dns name record

From: Sunry Chen (sunrychen_at_gmail.com)
Date: 09/28/05 

Date: Wed, 28 Sep 2005 22:53:43 +0800

jpd <read_the_sig@do.not.spam.it.invalid> wrote:
> Begin <6jrp03-scq2.ln1@cnzhijiao.com>
> There's no reason why you can't, except maybe that it depends on someone
> offering this service for free to you. Why should they?[0]
>
>
> Anyway, back to your real problem: Even with an MX lots of MTAs will not
> accept your mail if you are from a ``known'' dialin ip, whether or not
> you have an actual mx record. The thing to check for is to have a) valid
> reverse[1] and ideally also have b) matching forward and reverse records.
> Another thing is that you might end up in tainted netblocks and then no
> amount of reverse and forward matching will help.
>
> The way to get mail in a reliable fashion off your mobile box is to have
> another machine somewhere[2] that will accept mail from you after you've
> authenticated, and then sends it on to the destination. This can be done
> with a variety of MTAs on your own box.
>
>
> [0] Even if you can find such a someone, this is still a good question.
> [1] That is, there exists for the IP you're using a PTR record, preferably
> one that does NOT say ``<ip>.dialin.dynamic-pool.provider.com'', because
> to many a mail operator that implies ``should not originate email''.
> [2] Either operated by you, possibly co-located somewhere, or a paid-for
> service with a reputable mail provider.

Yes, you are right. Some smtp server may check if your ip belongs to
dynamic ip block, they would not talk to that kind of ip range.
Like mail.microsft.com, it will check if your ip is dynamic.

But for me, I usually need to use mailling list, they don't check your
ip is or isn't dynamic. So I still can be happy with it.

Sunry