Use sendmail as client for relaying mail

Question

I'm trying to use an account on my central mail server to send all mails from other boxes. My central mailserver is itracknetworks.ca and I have an account there at testuser@itracknetworks.ca. I currently have the following in sendmail.mc

[root@localhost mail]# cat sendmail.mc | grep -v "^dnl"
divert(-1)dnl
include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
VERSIONID(`setup for linux')dnl
OSTYPE(`linux')dnl

define(`SMART_HOST', `mail.itracknetworks.ca')

define(`confDEF_USER_ID', ``8:12'')dnl
define(`confTO_CONNECT', `1m')dnl
define(`confTRY_NULL_MX_LIST', `True')dnl
define(`confDONT_PROBE_INTERFACES', `True')dnl
define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')dnl
define(`ALIAS_FILE', `/etc/aliases')dnl
define(`STATUS_FILE', `/var/log/mail/statistics')dnl
define(`UUCP_MAILER_MAX', `2000000')dnl
define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl
define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
define(`confAUTH_OPTIONS', `A')dnl
define(`confTO_IDENT', `0')dnl
FEATURE(`no_default_msa', `dnl')dnl
FEATURE(`smrsh', `/usr/sbin/smrsh')dnl
FEATURE(`mailertable', `hash -o /etc/mail/mailertable.db')dnl
FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl
FEATURE(redirect)dnl
FEATURE(always_add_domain)dnl
FEATURE(use_cw_file)dnl
FEATURE(use_ct_file)dnl
FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl
FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl
FEATURE(`blacklist_recipients')dnl
EXPOSED_USER(`root')dnl
DAEMON_OPTIONS(`Port=25')
DAEMON_OPTIONS(`Port=26')
FEATURE(`accept_unresolvable_domains')dnl
LOCAL_DOMAIN(`localhost.localdomain')dnl
MASQUERADE_AS(`itracknetworks.ca')dnl
FEATURE(masquerade_envelope)dnl
MAILER(smtp)dnl
MAILER(procmail)dnl

Plus I have the following in my /etc/mail/access

AuthInfo:mail.itracknetworks.ca "U:faxes@itracknetworks.ca" "I:testuser@itracknetworks.ca" "P:*****" "M:LOGIN PLAIN"

But when I send the mail, I can see that it's still going from localhost.localdomain. I have read that SMART_HOST is only used if all other methods of delivery fail. So, how do I ensure that all mail goes through the account described in /etc/mail/access?

Thanks for the help.

score 1 · Answer 1 · edited Jun 11 '20 at 10:02

You could simplify your configuration down to following

include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
VERSIONID(`setup for linux')dnl
OSTYPE(`linux')dnl
FEATURE(`nullclient',`mail.itracknetworks.ca').

Excerpt from documentation

nullclient

This is a special case -- it creates a configuration file containing nothing but support for forwarding all mail to a central hub via a local SMTP-based network. The argument is the name of that hub.

The only other feature that should be used in conjunction with this one is FEATURE(`nocanonify'). No mailers should be defined. No aliasing or forwarding is done.

Use sendmail as client for relaying mail

1 Answers1