i have ipA -> web server
and ipB -> mail server

when i send a mail from outside the user receives it but when i send it from my web server in mail logs i get the following error

relay=[127.0.0.1] [127.0.0.1], dsn=5.1.1, stat=User unknown


can anyone help?

It looks like you have a mail server running locally and it cannot find the user, as it assumes the user is local. You can use ipB as a smarthost for ipA box

Regards

I tried that
# "Smart" relay host (may be null)
DSmail.domain.gr

and still the same error

sendmail -bv paragelia@domain.gr paragelia@domain.gr... User unknown
chimera:/etc/mail# Jan 28 15:26:30 chimera sendmail[4469]: 0SDQUEe004469: paragelia@domain.gr... User unknown

To test relay use just:

thats what i wrote
sendmail -bv paragelia@domain.gr


answer

paragelia@domain.gr... User unknown


i even tried without running sendmail service

You should have been told if the mailer is local or remote (esmtp)
You can add the email address in /etc/mail/virtusertable
Run:
makemap hash /etc/mail/virtusertable < /etc/mail/virtusertable and test again.

there's no such file

Check your distro's documentation.
If sendmail is configured with: "FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')", then you can create the file and run
the makemap command to create the hash database.

nope its not

Could you give more details, like distro, sendmail.mc etc

Meanwhile you can create a local user paragelia and put a .forward file in his homedir to forward email to paragelia@ipB.domain.gr

i created this user and the forward but still nothing


divert(-1)dnl
#-----------------------------------------------------------------------------
# $Sendmail: debproto.mc,v 8.14.3 2008-07-15 22:30:00 cowboy Exp $
#
# Copyright (c) 1998-2008 Richard Nelson. All Rights Reserved.
#
# cf/debian/sendmail.mc. Generated from sendmail.mc.in by configure.
#
# sendmail.mc prototype config file for building Sendmail 8.14.3
#
# Note: the .in file supports 8.7.6 - 9.0.0, but the generated
# file is customized to the version noted above.
#
# This file is used to configure Sendmail for use with Debian systems.
#
# If you modify this file, you will have to regenerate /etc/mail/sendmail.cf
# by running this file through the m4 preprocessor via one of the following:
# * make (or make -C /etc/mail)
# * sendmailconfig
# * m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
# The first two options are preferred as they will also update other files
# that depend upon the contents of this file.
#
# The best documentation for this .mc file is:
# /usr/share/doc/sendmail-doc/cf.README.gz
#
#-----------------------------------------------------------------------------
divert(0)dnl
#
# Copyright (c) 1998-2005 Richard Nelson. All Rights Reserved.
#
# This file is used to configure Sendmail for use with Debian systems.
#
define(`_USE_ETC_MAIL_')dnl
include(`/usr/share/sendmail/cf/m4/cf.m4')dnl
VERSIONID(`$Id: sendmail.mc, v 8.14.3-5 2008-07-15 22:30:00 cowboy Exp $')
OSTYPE(`debian')dnl
DOMAIN(`debian-mta')dnl
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
undefine(`confHOST_STATUS_DIRECTORY')dnl #DAEMON_HOSTSTATS=
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
dnl #
dnl # General defines
dnl #
dnl # SAFE_FILE_ENV: [undefined] If set, sendmail will do a chroot()
dnl # into this directory before writing files.
dnl # If *all* your user accounts are under /home then use that
dnl # instead - it will prevent any writes outside of /home !
dnl # define(`confSAFE_FILE_ENV', `')dnl
dnl #
dnl # Daemon options - restrict to servicing LOCALHOST ONLY !!!
dnl # Remove `, Addr=' clauses to receive from any interface
dnl # If you want to support IPv6, switch the commented/uncommentd lines
dnl #
FEATURE(`no_default_msa')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MTA-v6, Port=smtp, Addr=::1')dnl
DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp, Addr=127.0.0.1')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MSP-v6, Port=submission, M=Ea, Addr=::1')dnl
DAEMON_OPTIONS(`Family=inet, Name=MSP-v4, Port=submission, M=Ea, Addr=127.0.0.1')dnl
dnl #
dnl # Be somewhat anal in what we allow
define(`confPRIVACY_FLAGS',dnl
`needmailhelo,needexpnhelo,needvrfyhelo,restrictqrun,restrictexpand,nobodyreturn,authwarnings')dnl
dnl #
dnl # Define connection throttling and window length
define(`confCONNECTION_RATE_THROTTLE', `15')dnl
define(`confCONNECTION_RATE_WINDOW_SIZE',`10m')dnl
dnl #
dnl # Features
dnl #
dnl # use /etc/mail/local-host-names
FEATURE(`use_cw_file')dnl
dnl #
dnl # The access db is the basis for most of sendmail's checking
FEATURE(`access_db', , `skip')dnl
dnl #
dnl # The greet_pause feature stops some automail bots - but check the
dnl # provided access db for details on excluding localhosts...
FEATURE(`greet_pause', `1000')dnl 1 seconds
dnl #
dnl # Delay_checks allows sender<->recipient checking
FEATURE(`delay_checks', `friend', `n')dnl
dnl #
dnl # If we get too many bad recipients, slow things down...
define(`confBAD_RCPT_THROTTLE',`3')dnl
dnl #
dnl # Stop connections that overflow our concurrent and time connection rates
FEATURE(`conncontrol', `nodelay', `terminate')dnl
FEATURE(`ratecontrol', `nodelay', `terminate')dnl
dnl #
dnl # If you're on a dialup link, you should enable this - so sendmail
dnl # will not bring up the link (it will queue mail for later)
dnl define(`confCON_EXPENSIVE',`True')dnl
dnl #
dnl # Dialup/LAN connection overrides
dnl #
include(`/etc/mail/m4/dialup.m4')dnl
include(`/etc/mail/m4/provider.m4')dnl
dnl #
dnl # Default Mailer setup
MAILER_DEFINITIONS
MAILER(`local')dnl
MAILER(`smtp')dnl

dnl # Masquerading options
FEATURE(`always_add_domain')dnl
MASQUERADE_AS(`hostname')dnl
FEATURE(`allmasquerade')dnl
FEATURE(`masquerade_envelope')dnl

You don't even have a mailer, that's why .forward is not working.
Anyway take a look at this howto for Debian, to help you add procmail as mailer and also add virtusertable in sendmail config.

Regards

how do i change ctladdr=www-data to ctladdr=user@domain.gr ?

it didn't work when i changed my php.ini

You should define the From: address inside the mail() function. Read this for details and examples.

Regards