IP is not allowed to send mail as

[giftsnake]

<someotheruser@someothersite.com> (expanded from <testforward@domain>): host
   a.mx.someothersite.de[XX.HIS.IP.XX] said: 550 [SPF] XX.MY.IP.XX is not allowed to send
   mail as myusername@gmx.net. (in reply to RCPT TO command)
Reporting-MTA: dns; hostname.domain.com
X-Postfix-Queue-ID: 5719020E1D4
X-Postfix-Sender: rfc822; myusername@gmx.net
Arrival-Date: Tue, 15 Sep 2009 17:55:52 +0200 (CEST)

Final-Recipient: rfc822; someotheruser@someothersite.de
Original-Recipient: rfc822;testforward@domain.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; a.mx.someothersite.de
Diagnostic-Code: smtp; 550 [SPF] XX.MY.IP.XX is not allowed to send mail as
   myusername@gmx.net.

i have created a forward to someones mailaccount but i keep receiving those errormessages.

• hostname && hostname -f are the same
• dig domain.com SPF is the correct ip
• reverse DNS record at Hetzner is hostname.domain.com
• postfix config has hostname.domain.com in it, nothing else
• dig domain.com MX gives me domain.com

did i forget anything?

thanks in advance, giftsnake

[till]

The error message said that you tried to use a gmx.net address as sender email address (and not as recipient). This will not work, you have to use a sender address of one of your domains as you most likely dont own the domain gmx.net.

[giftsnake]

mh, is that the only function of forward-addresses?
thought i could forward to any mailaccount at any domain!

what i did:
create a new forward testforward at domain.com
typed the destination email(s) (most of them accepted my forwarded mail from gmx)

is this destination email limited to my own domain?

and of course i can send emails to this forward from any domain, even if i dont owe them

[till]

You can forward to any address at any account, but you seem to have used a wrong sender address in the email that you forwarded and thats why gmx refuses it.

[giftsnake]

when i send an email with my gmx directly to that adress, everything works fine.


same settings/config/username in the mail program!