András,
Firstly, I cannot see this being relevant to anyone on the list.
Secondly, from my personal experience SPF doesn't help very much - you will need DomainKey and that need to be setup in the MTA.
My personal solution to all mail delivery issues is to use Google Apps with my domain name. If your SMTP server has potentially or really bad reputation (spam history, shared hosting, home ISP IP) - the chances that your mail arrives at gmail/hotmail/other are terribly unstable. I know this from my work experience at a shared hosting company.
The solution to this is to have private IP on a private host or use gmail/hotmail/other.
Cheers,
Ilya
On Wed, Jul 06, 2011 at 07:15:50PM +0200, András Murányi wrote:
Dear List,
Gmail has made some changes so with emails that are not sent from the domain of the email address (eg: an email from donald@duck.com sent by an SMTP server smtp.alligator.com) I get warnings such as "This message may not have been sent by: donald@duck.com", and/or the sender is displayed as " donald@duck.com via alligator.com". I've made some research and all this is because of increasing protection against email spoofing. The solution is to add a so-called SPF (Sender Policy Framework) record to your DNS records. (More info: http://www.openspf.org/) Some ISPs like Godaddy support it with their DNS editor, some others need to add a TXT record manually (in my case something like this: "v=spf1 mx mx: smtp.myisp.net include:smtp.gmail.com include:myotherisp.net -all").
Hope this helps some of you.
Andras
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