Som andre har udtrykt herinde, oplever jeg også problemer med at sende mails til Windows Live, hotmail, mm. emailadresser.
Jeg sender fra mit domæne "uwemann.dk", og bruger MXhotel.dk som SMTP.
Her er noget fejlbesked:
This is the mail system at host mail01.mxhotel.dk.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
<###@msn.com> (expanded from <###@###.dk>): host
mx2.hotmail.com[65.55.92.168] said: 550 SC-001 Mail rejected by Windows
Live Hotmail for policy reasons. Reasons for rejection may be related to
content with spam-like characteristics or IP/domain reputation problems. If
you are not an email/network admin please contact your E-mail/Internet
Service Provider for help. Email/network admins, please visit
http://postmaster.live.com for email delivery information and support (in
reply to MAIL FROM command)
Reporting-MTA: dns; mail01.mxhotel.dk
X-Postfix-Queue-ID: 71E1EDF88F8
X-Postfix-Sender: rfc822; ###@uwemann.dk
Arrival-Date: Fri, 9 Jul 2010 21:15:51 +0200 (CEST)
Final-Recipient: rfc822; ###@msn.com
Original-Recipient: rfc822;###@###.dk
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx2.hotmail.com
Diagnostic-Code: smtp; 550 SC-001 Mail rejected by Windows Live Hotmail for
policy reasons. Reasons for rejection may be related to content with
spam-like characteristics or IP/domain reputation problems. If you are not
an email/network admin please contact your E-mail/Internet Service Provider
for help. Email/network admins, please visit http://postmaster.live.com for
email delivery information and supportEr her en SPF-haj, som kan give mig en streng at putte i TXT-recorden i DNS.
Jeg har læst guiden, men synes ikke at blive klogere. Jeg gider ikke bakse med at lave fejl, og så intet virker...

Mvh. Uwe