One my question about blocking Yahoo mail my clients with a large number of emails sent(customers are all from America)
Herpolsheimer mentioned that all e-mail services remove the limitation on the rate of sending messages using spf and dkim.
I decided to check it out, have the wrong domain to be used, screwed to it spf, asked for a list of email to send from the client and did a testmail with the text test in the body and the subject line. spf definitely doesn't help to send more letters.
A couple of days smoked bamboo and decided to get dkim to not break the current mail clients have decided to experiment with dkim on a micro instance from amazon.
Put a quick postfix, dkim-milter, generate keys, configure the milter added milter in postfix, I added the necessary keys in the dns record to the test domain.
From the console, send a letter to your AK gmail and receive e-mail source
dkim=neutral (body hash did not verify)
See that the dkim signature is, records in the dns via nslookup, get the right.
How to know what is the error?