topic Re: Sendmail -- plz help in Operating System - Linux

Sendmail -- plz help

Maaz — Sun, 08 Jan 2006 09:29:55 GMT

smtp server is ssendmail

I have two mail domains, both are maintained/configure on separate machines
Sendmail 8.x is used as smtp or MTA.

one is smtpC.abc.com(IP: 10.0.0.55), mail server for abc.com
and
second is smtpZ.xyz.com(IP: 10.0.0.100) mail server for xyz.com domain

now if a user say a@abc.com mails to b@abc.com ... success
now if a user say c@xyz.com mails to d@xyz.com ... success

but if a@abc.com mails to d@xyz.com ... failure

on smtpC.abc.com (Sender)
---------------
tail -f /var/log/maillog

Jan 8 16:44:20 smtpC Sendmail[2484]: K088hrwL002483: SYSERR(root): smtpZ.xyz.com. config error: mail loops back to me (MX problem?)

Jan 8 16:44:20 smtpC Sendmail[2484]: K088hrwL002483: to=, ctladdr= (507/508), delay=00:00:15, xdelay=00:00:15, mailer=esmtp, pri=60555, relay=smtpZ.xyz.com [10.0.0.50], dsn=5.3.5, start=Local config error

Jan 8 16:44:20 smtpC Sendmail[2484]: K0Bhnwl002483: K088ikwl002484: DSN: Local Config error

and root received mail which contains following message

---The following adress had permanent fatal errors ----

(reason: 533 5.3.5 system config error)

on smtpZ.xyz.com (Receiver)
---------------
tail -f /var/log/maillog

Jan 8 16:44:20 smtpZ Sendmail[2484]: K086j0wl002484: [10.0.0.99] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

Plz help me

Regards
Maaz

Re: Sendmail -- plz help

Vitaly Karasik_1 — Sun, 08 Jan 2006 09:58:14 GMT

what is your DNS setup for these two domains?
e.g., I'd like to see output of

host -t mx abc.com
host -t mx xyz.com

Re: Sendmail -- plz help

Maaz — Sun, 08 Jan 2006 11:46:50 GMT

Thankx Dear Vitaly Karasik

DNS is working JUST fine

host -t mx abc.com
abc.com mail is handled by 10 smtpC.abc.com

host -t mx xyz.com
xyz.com mail is handled by 10 smtpZ.xyz.com

Regards
Maaz

Re: Sendmail -- plz help

Maaz — Sun, 08 Jan 2006 11:56:53 GMT

I m sure DNS is not the issue here, because I have tested it with 'host -t mx domainname' command and its also clear that when a@abc.com tries to send mail to d@xyz.com, the mail server for abc.com i.e smtpC.abc.com(Sender/forwarder) succesfuly hit/access the mail server for xyz.com i.e smtpZ.xyz.com(Receiver) and that is confirm/varified with the following output(this output comes when smtpC.abc.com tries to forward mail to d@xyz.com)

on smtpZ.xyz.com (Receiver)
---------------
tail -f /var/log/maillog

Jan 8 16:44:20 smtpZ Sendmail[2484]: K086j0wl002484: [10.0.0.99] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

Regards
Maaz

Re: Sendmail -- plz help

Steven E. Protter — Sun, 08 Jan 2006 14:47:48 GMT

Couple of tricks.

You need to see that your MX records in DNS permit routing of mail like you expect it to route.

Next you may need to do a sendmail macro or the complex sendmail.cf equivalent of one of these tricks.

Cwnapervilleapartments.com

Enables the sendmail daemon to accept mail from in this example napervilleapartments.com

MASQUERADE_DOMAIN(napervilleapartments.com)dnl

Same trick here. I do not know if both are needed, I do both because I don't normally have time to futz around.

If the MX records permit the routing and the sendmail daemon is configured, the server should accept the mail.

SEP

Re: Sendmail -- plz help

Vitaly Karasik_1 — Mon, 09 Jan 2006 03:02:54 GMT

>second is smtpZ.xyz.com(IP: 10.0.0.100) >mail server for xyz.com domain

>but if a@abc.com mails to d@xyz.com ... >failure

>on smtpC.abc.com (Sender)
>---------------
>tail -f /var/log/maillog

>Jan 8 16:44:20 smtpC Sendmail[2484]: >K088hrwL002483: to=, >ctladdr= (507/508), >delay=00:00:15, xdelay=00:00:15, >mailer=esmtp, pri=60555, >relay=smtpZ.xyz.com [10.0.0.50], dsn=5.3.5, >start=Local config error

I don't understand why we see 10.0.0.50 in maillog. May be make sense to check DNS and /etc/hosts on both servers again?

Re: Sendmail -- plz help

Maaz — Tue, 10 Jan 2006 13:02:06 GMT

and yes Vitaly Karasik i had make some errors in posting maillog .. plz check the following to understand my prblm... tHanKs

smtpC.abc.com IP: 10.0.0.6
smtpZ.xyz.com IP: 10.0.0.5

on smtpC.abc.com (Sender)
---------------
tail -f /var/log/maillog

Jan 8 16:44:20 smtpC Sendmail[2484]: K088hrwL002483: SYSERR(root): smtpZ.xyz.com. config error: mail loops back to me (MX problem?)

Jan 8 16:44:20 smtpC Sendmail[2484]: K088hrwL002483: to=, ctladdr= (507/508), delay=00:00:15, xdelay=00:00:15, mailer=esmtp, pri=60555, relay=smtpZ.xyz.com [10.0.0.5], dsn=5.3.5, start=Local config error

Jan 8 16:44:20 smtpC Sendmail[2484]: K0Bhnwl002483: K088ikwl002484: DSN: Local Config error

and root received mail which contains following message

---The following adress had permanent fatal errors ----

(reason: 533 5.3.5 system config error)

on smtpZ.xyz.com (Receiver)
---------------
tail -f /var/log/maillog

Jan 8 16:44:20 smtpZ Sendmail[2484]: K086j0wl002484: smtpC.abc.com [10.0.0.6] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

I m sure DNS is not the issue here, because I have tested it with 'host -t mx domainname' command and its also clear that when a@abc.com tries to send mail to d@xyz.com, the mail server for abc.com i.e smtpC.abc.com(Sender/forwarder) succesfuly hit/access the mail server for xyz.com i.e smtpZ.xyz.com(Receiver) and that is confirm/varified with the following output(this output comes when smtpC.abc.com tries to forward mail to d@xyz.com)

on smtpZ.xyz.com (Receiver)
---------------
tail -f /var/log/maillog

Jan 8 16:44:20 smtpZ Sendmail[2484]: K086j0wl002484: smtpC.abc.com [10.0.0.6] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

Plz help me

Re: Sendmail -- plz help

Maaz — Tue, 10 Jan 2006 13:08:02 GMT

Dear SEP
>You need to see that your MX records in DNS permit routing of mail like you
>expect it to route.

How I can know that.. which file and what syntax should i write ?

Re: Sendmail -- plz help

Ivan Ferreira — Tue, 10 Jan 2006 13:47:53 GMT

To check that DNS is correct, use:

dig xyz.com MX

You must have an answer section that shows the MX record that is your mail server.

Re: Sendmail -- plz help

Maaz — Tue, 10 Jan 2006 14:16:02 GMT

Thanks Ivan Ferreira
DNS is working just fine.
Plz see my previous post.

I think I should describe what I have done to configure my mail servers(smtpC and smtpZ)

1) in sendmail.mc i simply put "dnl" b4 the line deamon_options(....127.0.0.1...)
2) m4 sendmail.mc > sendmail.cf
3) in access i add 3 lines
10 RELAY
abc.com RELAY
xyz.com RELAY

4a) on smtpC in local-host-names i add
abc.com
4b) on smtpZ in local-host-names i add
xyz.com
5) make
6) servce sendmail start
8) /etc/resolv.conf
nameserver 10.0.0.99
nameserver 10.0.0.100
Note: Both mail servers are client of the same dns server

Re: Sendmail -- plz help

Vitaly Karasik_1 — Wed, 11 Jan 2006 02:16:24 GMT

Maaz, can you send us your sendmail.mc files?

Re: Sendmail -- plz help

Vipulinux — Wed, 11 Jan 2006 04:25:27 GMT

Hi

You need to make sure that both the domains are added to the /etc/mail/access
eg in abc add
xyz RELAY

try this, does it amke a difference.

Cheers

Re: Sendmail -- plz help

Ivan Ferreira — Wed, 11 Jan 2006 07:15:02 GMT

I think that this won't be the problem because you don't have relaying denied, but by default mail will go as user@servername.domain.com, so in your access database you should also add:

domain.com
servername.domain.com

What if you connect via telnet to the port 25 and send the mail interactively:

telnet mailserver 25

helo domain.com
mail from: username@domain.com
rcpt to: username@domain2.com
data
subject: testing
just testing
.
quit

What do you see in the logs?

Re: Sendmail -- plz help

Maaz — Wed, 18 Jan 2006 13:35:03 GMT

Thanks Dear All, esp Vitaly Karasik, and Ivan Ferreira for the continous help and support.

the only prblm was that /etc/hosts file was not configured properly on both servers.

i.e on smtpC.abc.com /etc/hosts was
127.0.0.1 smtpc localhost localhost.localdomain

i.e on smtpZ.xyz.com /etc/hosts was
127.0.0.1 smtpz localhost localhost.localdomain

problem was solved after i edit /etc/hosts file on both server as:

127.0.0.1 smtpC.abc.com localhost localhost.localdomain

127.0.0.1 smtpZ.xyz.com localhost localhost.localdomain

Thanks All Once Again
Regards
Maaz