Sendmail and Exchange

[jpp7717]

Hey all,

I am a newbie to linux and sendmail. I have set up a redhat 7.3 box at work. Its inside the firewall and i can browse it from the other machines(windows) at work thru sanmba. I am trying to setup sendmail so that i will be able to send e-mails to coworkers thru exchange. I can telnet to port 25 on the exchange server fine. However when i try and send an email it gives me an error, connection refused by smtp.our domain name.com I have setup masquerading on the linux box. Any help would be much appreciated

 

[sproosy]

if ur behind a firewall which i think you would, just recompile sendmail with the promiscous_relay option.

Sproosy MCP

Keep it real!

 

[Rhinokiller]

BE VERY CAREFUL WITH THE PROMISCUOUS_RELAY OPTION !!!!!
You are creating an open relay if port 25 is not secured.
Jpp7717 .... is port 25 on the Linux box connected to the internet via firewall/dmz ?

Cogito Ergo Sum - Non Compos Mentis

 

[bwilliam13]

Sounds like you need to tell the Exchange server to allow relaying from the Linux box. You shouldn't have to recompile sendmail that came with 7.3 to allow this. Promiscuous relay is just about always a BAD idea.

 

[jpp7717]

Rhinokiller & bwilliam13,
I can telnet from linux to the exchange server fine. I can't telnet to port 25 on the linux box from a windows machine, though. I've had our network admin. add the ip of my linux box to the exchange server to allow relaying. I'm going crazy with this problem for over a week now. i've included a copy of my sendmail.mc. Any help is much appreciated.


(SENDMAIL.MC)

divert(-1)
dnl This is the sendmail macro config file. If you make changes to this file,
dnl you need the sendmail-cf rpm installed and then have to generate a
dnl new /etc/sendmail.cf by running the following command:
dnl
dnl m4 /etc/mail/sendmail.mc > /etc/sendmail.cf
dnl
include(`/usr/share/sendmail-cf/m4/cf.m4')
VERSIONID(`linux setup for Red Hat Linux')dnl
OSTYPE(`linux')
dnl Uncomment and edit the following line if your mail needs to be sent out
dnl through an external mail server:
dnl define(`SMART_HOST',`smtp.your.provider')
define(`confDEF_USER_ID',``8:12'')dnl
undefine(`UUCP_RELAY')dnl
undefine(`BITNET_RELAY')dnl
define(`confAUTO_REBUILD')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
dnl define(`STATUS_FILE', `/etc/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
dnl TRUST_AUTH_MECH(`DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
dnl define(`confAUTH_MECHANISMS', `DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
dnl define(`confTO_QUEUEWARN', `4h')dnl
dnl define(`confTO_QUEUERETURN', `5d')dnl
dnl define(`confQUEUE_LA', `12')dnl
dnl define(`confREFUSE_LA', `18')dnl
dnl FEATURE(delay_checks)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
dnl The '-t' option will retry delivery if e.g. the user runs over his quota.
FEATURE(local_procmail,`',`procmail -t -Y -a $h -d $u')dnl
FEATURE(`access_db',`hash -o /etc/mail/access.db')dnl
FEATURE(`blacklist_recipients')dnl
EXPOSED_USER(`root')dnl
dnl This changes sendmail to only listen on the loopback device 127.0.0.1
dnl and not on any other network devices. Comment this out if you want
dnl to accept email over the network.
dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
dnl NOTE: binding both IPv4 and IPv6 daemon to the same port requires
dnl a kernel patch
dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')
dnl We strongly recommend to comment this one out if you want to protect
dnl yourself from spam. However, the laptop and users on computers that do
dnl not have 24x7 DNS do need this.
FEATURE(`accept_unresolvable_domains')dnl
dnl FEATURE(`relay_based_on_MX')dnl
FEATURE(`masquerade_envelope')dnl
MASQUERADE_AS(wolffsamson.com)dnl
MAILER(smtp)dnl
MAILER(procmail)dnl
Cwlocalhost.localdomain

 

[redwhip]

Have you set up Exchange to use the Linux box as a smart host?
If you are just using Exchange for internal mail and calendar then you can just setup seperate internal mailboxes on there. Otherwise you could have all mail for mydomain.com forwarded to Exchange and just use the Linux box as a gatekeeper/relay server/firewall this solution would need the smart host set up.

 

[jpp7717]

Thanks everyone for their help, i finally got sendmail to function properly.

jpp7717

 

[custodes]

I have to do the same thing on Monday. If you would be so kind, what did you have to do to get it working?