Acabei de configurar o DNS reverso em nosso sistema e definir o nome do host do servidor como mydomain.com . Desde que eu fiz isso - o Sendmail enviará para qualquer domínio exceto mydomain.com . Eu li ESTA PERGUNTA , mas o OP nessa questão não tinha "validação de que o domínio pertenceu ao servidor. Eu tenho um site com mydomain.com no servidor, o A e PTR registra todos os pontos corretamente para o servidor. Os registros MX de mydomain.com apontam para mx1.emailsrvr.com e mx2.emailsrvr.com corretamente (Rackspace).
Estou assumindo que ele acha que o e-mail é local e, portanto, não o envia "fora", mas não tenho certeza.
Aqui está um exemplo de um registro para uma mensagem que foi enviada e recebida corretamente:
Oct 29 16:29:10 mydomain sendmail[1421]: w9TLTA1w001421: from=zak, size=389, class=0, nrcpts=1, msgid=<[email protected]>, relay=zak@localhost
Oct 29 16:29:10 mydomain sm-mta[1422]: w9TLTABl001422: from=<[email protected]>, size=565, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=mydomain.com [127.0.0.1]
Oct 29 16:29:10 mydomain sendmail[1421]: w9TLTA1w001421: [email protected], ctladdr=zak (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30389, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (w9TLTABl001422 Message accepted for delivery)
Oct 29 16:29:11 mydomain sm-mta[1424]: STARTTLS=client, relay=gmail-smtp-in.l.google.com., version=TLSv1.2, verify=FAIL, cipher=ECDHE-RSA-AES128-GCM-SHA256, bits=128/128
Oct 29 16:29:11 mydomain sm-mta[1424]: w9TLTABl001422: to=<[email protected]>, ctladdr=<[email protected]> (1000/1000), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=120565, relay=gmail-smtp-in.l.google.com. [173.194.195.26], dsn=2.0.0, stat=Sent (OK 1540848551 k3-v6si10178885ite.86 - gsmtp)
Aqui está um exemplo de um email que nunca foi recebido do outro lado:
Oct 29 16:24:31 mydomain sendmail[544]: w9TLOV8v000544: from=zak, size=375, class=0, nrcpts=1, msgid=<[email protected]>, relay=root@localhost
Oct 29 16:24:31 mydomain sm-mta[545]: w9TLOVxv000545: from=<[email protected]>, size=552, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=mydomain.com [127.0.0.1]
Oct 29 16:24:31 mydomain sendmail[544]: w9TLOV8v000544: [email protected], ctladdr=zak (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30375, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (w9TLOVxv000545 Message accepted for delivery)
Oct 29 16:24:31 mydomain sm-mta[546]: w9TLOVxv000545: to=<[email protected]>, ctladdr=<zak@mydomain com> (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30762, dsn=2.0.0, stat=Sent
Aqui está o meu sendmail.mc
define('_USE_ETC_MAIL_')dnl
include('/usr/share/sendmail/cf/m4/cf.m4')dnl
VERSIONID('$Id: sendmail.mc, v 8.15.2-3 2015-12-10 18:02:49 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')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
define('MAIL_HUB', 'mydomain.com.')dnl
define('LOCAL_RELAY', 'mydomain.com.')dnl
Há alguma coisa que mostre por que o sendmail enviará para todos os domínios exceto mydomain.com? Usamos o Rackspace para o email mydomain.com s. Se eu fizer um dig MX para mydomain.com, os registros MX também serão exibidos corretamente. Estou perplexo!
Basta nomear o host corretamente. Nenhum sistema deve ter um nome de host igual ao nome de domínio nu. Entre outras coisas, quebra o email. O Sendmail vê o nome do host local e, se ele corresponder ao domínio do destinatário do email recebido, ele supõe que deve entregá-lo localmente e ignora completamente os registros MX.