mail issues questions

[Ehud Karni]

On Mon, 28 Feb 2011 13:46:10 +0200, Dima (Dan) Yasny wrote:
>
> DKIM is a method of publishing a public key in a txt DNS record, with which
> the subject line of every email sent, is signed. When yahoo MTA's receive an
> email, they don't just check the PTR record, they also check the subject
> line signature, with the public key available in the DNS records. If the
> signatures match - email goes through, otherwise it's dropped.
>
> And as for SPF: http://en.wikipedia.org/wiki/Sender_Policy_Framework

Thank you for your explanations.

> > 2011/2/28 Hetz Ben Hamo <hetzbh at gmail.com>:
> > > [ use of DKIM and SPF for sending mail to Yahoo and Hotmail]

This mail server - unix.mvs.co.il - does not have/use SPF/DKIM.
The mail sent from it (or by it - it is used as remailer too) is not
rejected from Yahoo, Gmail and many other mail servers (I did not
check Hotmail, but as no mail returns from it, I assume it works too).

I did get some rejects from revers DNS checker that don't do it right.

I think Hetz's email rejection is either because of improper setting
of its SPF, or because his IP is in some mail blacklist (you can use
http://www.dnsbl.info/dnsbl-database-check.php to check).

Ehud.


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