My server send e-mails that are considered SPAM

4 msg	Rewriting To: field for outbound messages

My server send e-mails that are considered SPAM
\ Daniel Antonio Fernandes Bojczuk (29 Mar 2008)
. \ Terry Carmen (29 Mar 2008)
. . \ Daniel Antonio Fernandes Bojczuk (30 Mar 2008)
. . . \ Sahil Tandon (30 Mar 2008)
. . . . \ John Evans (30 Mar 2008)
. . . \ (Wietse Venema) (30 Mar 2008)
. \ mouss (29 Mar 2008)
. . \ Daniel Antonio Fernandes Bojczuk (30 Mar 2008)
. . . \ mouss (30 Mar 2008)
. . . . \ Mark Walling (30 Mar 2008)
. . . . . \ Daniel Antonio Fernandes Bojczuk (31 Mar 2008)
. . . . . . \ mouss (31 Mar 2008)
. . . . . . \ John Evans (31 Mar 2008)

6 msg	Web Based Front End - Update
2 msg	mailman subdomain not recognized by some mail s...
14 msg	Trying to feed an script with an email
5 msg	Q: smtpd_recipient_restrictions w/reject_unlist...
2 msg	Question about recipient canonical rewrite and ...
3 msg	QQ regarding server performance impact when doi...
1 msg	Re: qshape and greylisting
4 msg	Address Verification Question
8 msg	Distributed mailbombing on one address
2 msg	Trouble with postmaster alias
5 msg	Parent domains confusion?
2 msg	Anti-virus scanning with Postfix & Mac OS X
2 msg	Folder Structure help
8 msg	qmgr_active_corrupt
3 msg	retiring a mail server
2 msg	SMTP verification
9 msg	Multiple IPs
2 msg	Controlling out going messages

Subject:	My server send e-mails that are considered SPAM
Group:	Postfix-users
From:	Daniel Antonio Fernandes Bojczuk
Date:	29 Mar 2008

Hi,

I'm trying to configure a Mail Server using Postfix. The server is
apparantly working fine, it's receiving and sending e-mails.
The problem is that every e-mail that I send is considered SPAM by Yahoo,
Hotmail and Gmail. I checked if the server IP is in some Black lists, but it
isn't.

I really don't know what to do.

Sorrt about my English. Thanks for helping.

--
Daniel Bojczuk