Help with sendmail

Help with sendmail

[MattyB]

Hello,

I have setup sendmail on my RedHat ES V4 and I need to setup sendmail on
this machine as an SMTP relay host only.  It will not receive email, just
send it from the localhost and another host that will send mail via a J2EE
application.

I setup sendmail to accept relaying from other hosts, and I don't recieve
any errors when sending mail from others hosts or the local host (using
sendmail -v <email_address>), but all the emails I send are stuck in the que
and they can't seem to get out.  I tried sending emails to my personal
yahoo.com and netzero.net email accounts, and I receive no error messages,
but when I check the que using  "mailq", I see the following (my real email
address was replayced with (my address)):

l8NJtYPd010475        0 Sun Sep 23 14:55 <root@localhost.localdomain>
                 (Deferred: Connection timed out with c.mx.mail.yahoo.com.)
                                         <(my address)@yahoo.com>
l8NK2pNn010766        0 Sun Sep 23 15:02 <root@localhost.localdomain>
                 (Deferred: Connection timed out with d.mx.mail.yahoo.com.)
                                         <(my address)@yahoo.com>
l8NKGcw4011501*      48 Sun Sep 23 15:16 <root@localhost.localdomain>
                 (Deferred: Connection timed out with mx.dca.untd.com.)
                                         <(my address)@netzero.net>

DNS is setup properly because I can ping smtp.mail.yahoo.com as well as the
MX addressed above.

Any ideas?

Thanks,

Matt
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Re: Help with sendmail

[Adrian Calinescu]

MattyB wrote:


> 
> I setup sendmail to accept relaying from other hosts, and I don't recieve
> any errors when sending mail from others hosts or the local host (using
> sendmail -v <email_address>), but all the emails I send are stuck in the que
> and they can't seem to get out.  I tried sending emails to my personal
> yahoo.com and netzero.net email accounts, and I receive no error messages,
> but when I check the que using  "mailq", I see the following (my real email
> address was replayced with (my address)):
> 
> l8NJtYPd010475        0 Sun Sep 23 14:55 <******root@localhost.localdomain******>
					
							^^^^^^^^^^^^There's your problem.




--Adrian.

Re: Help with sendmail

[Glynn Clements]

MattyB wrote:

> I have setup sendmail on my RedHat ES V4 and I need to setup sendmail on
> this machine as an SMTP relay host only.  It will not receive email, just
> send it from the localhost and another host that will send mail via a J2EE
> application.
> 
> I setup sendmail to accept relaying from other hosts, and I don't recieve
> any errors when sending mail from others hosts or the local host (using
> sendmail -v <email_address>), but all the emails I send are stuck in the que
> and they can't seem to get out.  I tried sending emails to my personal
> yahoo.com and netzero.net email accounts, and I receive no error messages,
> but when I check the que using  "mailq", I see the following (my real email
> address was replayced with (my address)):
> 
> l8NJtYPd010475        0 Sun Sep 23 14:55 <root@localhost.localdomain>

As Adrian notes, localhost.localdomain isn't valid. You need to either
configure your hostname and domain to something which is valid, or
tell sendmail to masquerade as an appropriate domain, e.g.:

	FEATURE(`masquerade_envelope')dnl
	MASQUERADE_AS(`my.domain.com')dnl
	MASQUERADE_DOMAIN(`localhost.localdomain')dnl

If you use the domain from your email address, ensure that all mails
are sent using a valid username (i.e. don't use "root" unless you have
an entire domain; do *not* send mail which has root@yahoo.com as the
sender).

When originating mail locally, you can use the -f option to set the
envelope sender. Note that this will generate an X-Authentication-Warning
header if the sender isn't trusted (in class T, normally read from
/etc/mail/trusted-users).

>                  (Deferred: Connection timed out with c.mx.mail.yahoo.com.)

"Connection timed out" suggests a networking problem. Does e.g. 
"telnet c.mx.mail.yahoo.com. 25" work from the host running sendmail?

Note that many ISPs prohibit direct outbound SMTP connections,
requiring that mail is sent through their mail servers.

If this is the case, you need to configure sendmail to forward
outbound email to their server , e.g.:

	define(`SMART_HOST', `mail.yourisp.net')

-- 
Glynn Clements <glynn@gclements.plus.com>