Sendmail issue

[Mridul Dutta]

Hi All,

Are you able to tell me how it is possible that is able to send mail to "mridul@in.ibm.com" via mailx command
even though /etc/mail/sendmail.cf specifies a blank "DS" value?

Regards

Mridul

[Anshumali · Accepted solution]

1. DNS integration
2. Host file.
do a
sendmail -v -d9.99 -d38.99 mridul@in.ibm.com < /dev/null

and see how it is sending the mail. this will give you a debug output for this email and how it is resolving the names and aliases.

Anshu

[Mridul Dutta]

Hi Anshu,


My host name is : codrp01

domain : westpac.com.au

See the result .
/usr/sbin/sendmail -v -d9.99 -d38.99 kwun@westpac.com.auseq_map_parse(aliases.files, )
getauthinfo: root@localhost
map_init(sequence:aliases.files, NULL, 0)
sequence:aliases.files NULL: valid
map_init(implicit:Alias0, /etc/mail/aliases, 0)
wrong pass (pass = 0, rebuildable = 1)
map_init(host:host, NULL, 0)
host:host NULL: valid
map_init(switch:aliases, aliases, 0)
switch_map_open(aliases, aliases, 0)
switch_map_find => 1
files
map_stack[0] = sequence:aliases.files
switch:aliases aliases: valid
map_init(dequote:dequote, NULL, 0)
dequote:dequote NULL: valid
map_init(host:resolve, NULL, 0)
host:resolve NULL: valid
map_init(sequence:aliases.files, NULL, 1)
wrong pass (pass = 1, rebuildable = 0)
map_init(implicit:Alias0, /etc/mail/aliases, 1)
impl_map_open(Alias0, /etc/mail/aliases, 0)
hash_map_open(Alias0, /etc/mail/aliases, 0)
impl_map_lookup(Alias0, @)
db_map_lookup(Alias0, @)
implicit:Alias0 /etc/mail/aliases: valid
map_init(host:host, NULL, 1)
wrong pass (pass = 1, rebuildable = 0)
map_init(switch:aliases, aliases, 1)
wrong pass (pass = 1, rebuildable = 0)
map_init(dequote:dequote, NULL, 1)
wrong pass (pass = 1, rebuildable = 0)
map_init(host:resolve, NULL, 1)
wrong pass (pass = 1, rebuildable = 0)
host_map_lookup(westpac.com.au) => getcanonname(westpac.com.au), trying files
text_getcanonname(westpac.com.au)
getcanonname(westpac.com.au), trying dns
getcanonname(westpac.com.au), found
westpac.com.au
kwun@westpac.com.au... Connecting to smtphubs.intranet.westpac.com.au. via esmtp...
220 "ESMTP Server at Mon, 5 Nov 2007 16:01:44 +1100"
>>> EHLO codrp01.eccc.nsw.westpac.com.au
250-prcchb01.intranet.westpac.com.au Hello codrp01.eccc.nsw.westpac.com.au ([10.4.13.218]), pleased to meet you
250-HELP
250-SIZE
250 PIPELINING
>>> MAIL From:
250 t004535@codrp01.eccc.nsw.westpac.com.au... Sender OK
>>> RCPT To:
250 kwun@westpac.com.au... Recipient OK
>>> DATA
354 Enter message, end with "." on a line by itself
>>> .
250 Message accepted for delivery
kwun@westpac.com.au... Sent (Message accepted for delivery)
Closing connection to smtphubs.intranet.westpac.com.au.
>>> QUIT
221 prcchb01.intranet.westpac.com.au SMTP Service closing transmission channel
closemaps: closing aliases.files (NULL)
closemaps: closing Alias0 (/etc/mail/aliases)
impl_map_close(Alias0, /etc/mail/aliases, 12a3)
db_map_close(Alias0, /etc/mail/aliases, 12a3)
closemaps: closing host (NULL)
closemaps: closing aliases (aliases)
closemaps: closing dequote (NULL)
closemaps: closing resolve (NULL)

[whiteknight]

Mridul,

yes it is possible to perform sendmail in a blank "DS" value, because your organization has configured DNS, so it will identify the root name server

WK

[Mridul Dutta]

Thats true ...


i m giving one example to understand better ..
i m getting mails from "abc01"

Hostname from where i m getting mail "abc01" and there is no entry for rely sever in sendmail.cf.


Now i wants to find out how i m getting mails from "abc01" without rely server.

For this where i need to check all details.

[Anshumali]

Not sure what your exact query is:
but if you have DNS integrated, it can very well give you the MX records. Relay can be configured at the Exchange server level and blocked as well.
See below:
westpac.com.au MX resolved by DNS to smtphubs.intranet.westpac.com.au
If you do a
nslookup
set type=mx
westpac.com.au

you will see the MX records.

Thanks,
Anshu