The sender of this message could not be verified by Sender ID.

[blackhorse]

sendmail_from [e-mail] [e-mail]
sendmail_path /usr/sbin/sendmail -t -i /usr/sbin/sendmail -t -i
serialize_precision 100 100
short_open_tag On On
SMTP localhost localhost

This is the php set up of the server.

When I used the mail() send an e-mail to my hotmail account, I got this error message. "The sender of this message could not be verified by Sender ID."

1) The set up shows SMTP is using the localhost, so why I got this problem? Does it have to do with the server set this "sendmail_from [e-mail] [e-mail]" (that is the exact value the server administrator leaves it.)?

2) Or anything else I can ask server administrator to do so I would not get this error message "The sender of this message could not be verified by Sender ID." in the email I send out?

3) Anything else I can do if server administrator cannot do anything, such as by add codes, change the set up for the site, such as use .htaccess etc.?

4) I have another site sitting at another server, at that server, in php.ini, the SMTP use different IP address. And I got the "The sender of this message could not be verified by Sender ID." error too, in that case, what should I do?

Thanks!

[blackhorse]

I did a google search and I found this

Microsoft estimates millions of senders now publish SPF records, and the pressure is on for those who don't to start doing so in the coming months. Starting in November, MSN has said it will begin filtering messages from senders who do not publish records.

--

So how can I do to ask my server administrator to publish SDF records?

[blackhorse]

Microsoft has insert this note into hotmail since Nov. last year. I thought it would be a popular problems many people will face.

Thanks!