OK, thanks. Well, that certainly confirms that there is a discrepancy between the macro and the config. If Sendmail was actually having its config properly re-generated, that DS line would read something like DSsmtp.zoho.com, but instead it's blank. Do you have the sendmail-cf package installed ? If not, that might explain why it's not re-building properly. Does your m4 command return any errors when you run it ?
Also, could you provide the output of the following commands, please ? These are to check if Sendmail is hard-configured to masquerade for any particular domains.
Hopefully we'll get to the bottom of this soon. The main thing is to check that you have sendmail-cf installed. If you don't have it installed, then install it, try re-building your config, and see if things start to work.
OK, thanks. Well, that certainly confirms that there is a discrepancy between the macro and the config. If Sendmail was actually having its config properly re-generated, that DS line would read something like DSsmtp.zoho.com, but instead it's blank. Do you have the sendmail-cf package installed ? If not, that might explain why it's not re-building properly. Does your m4 command return any errors when you run it ?
Also, could you provide the output of the following commands, please ? These are to check if Sendmail is hard-configured to masquerade for any particular domains.
Hopefully we'll get to the bottom of this soon. The main thing is to check that you have sendmail-cf installed. If you don't have it installed, then install it, try re-building your config, and see if things start to work.
I do not know how to check if sendmail-cf is pre-installed or not.
I however, tried installing it anyways. See the Output below.
Code:
[root@development_techx ~]# yum install sendmail-cf
Loaded plugins: fastestmirror, replace
base | 3.6 kB 00:00:00
centos-sclo-rh | 2.9 kB 00:00:00
centos-sclo-sclo | 2.9 kB 00:00:00
cwp | 2.9 kB 00:00:00
epel/x86_64/metalink | 12 kB 00:00:00
epel | 4.3 kB 00:00:00
extras | 3.4 kB 00:00:00
mariadb | 2.9 kB 00:00:00
remi-safe | 2.9 kB 00:00:00
Not using downloaded repomd.xml because it is older than what we have:
Current : Wed Aug 30 17:35:30 2017
Downloaded: Sat Aug 26 05:24:20 2017
updates | 3.4 kB 00:00:00
webtatic | 3.6 kB 00:00:00
(1/2): epel/x86_64/updateinfo | 817 kB 00:00:01
(2/2): epel/x86_64/primary_db | 4.8 MB 00:00:02
Loading mirror speeds from cached hostfile
* base: mirrors.kernel.org
* epel: mirror.sfo12.us.leaseweb.net
* extras: mirrors.kernel.org
* remi-safe: mirrors.thzhost.com
* updates: mirrors.kernel.org
* webtatic: sp.repo.webtatic.com
Package sendmail-cf-8.14.7-4.el7.noarch already installed and latest version
Nothing to do
After this i ran
Code:
m4 /etc/mail/sendmail.mc > /etc/mailsendmail.cf
There is no output generated but i did make sure the command did not error using echo $? returning 0
I then restarted the smtp service but mail still does not work.
Seems the cf is still not generated properly.
Code:
1.
grep ^DS /etc/mail/sendmail.cf
DS
2.
grep -i masq /etc/mail/sendmail.mc
dnl MASQUERADE_AS(`mydomain.com')dnl
dnl # masquerade not just the headers, but the envelope as well
dnl FEATURE(masquerade_envelope)dnl
dnl # masquerade not just @mydomainalias.com, but @*.mydomainalias.com as well
dnl FEATURE(masquerade_entire_domain)dnl
dnl MASQUERADE_DOMAIN(localhost)dnl
dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl
dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl
dnl MASQUERADE_DOMAIN(mydomain.lan)dnl
3.
grep ^DM /etc/mail/sendmail.cf
No Output
4.
grep ^C\{M /etc/mail/sendmail.cf
No Output
Please suggest if you spot anything or need more info.
Hmm, I'm afraid I'm not really sure why you're having this problem of your config not building correctly. At least we can be sure your Sendmail isn't masquerading as zoho.com or anything like that, so all it should need (all other things being equal, anyway) is the smart relay actually getting set.
Now, I wouldn't normally recommend this these days, but it is possible to edit the sendmail.cf file directly. This is usually a bad idea for two reasons: firstly because it's a lot easier to get things very badly wrong, and secondly because it puts the config out-of-sync with the macro, but that already seems to be broken anyway for some reason.
So, you could always try changing the DS line in your sendmail.cf so that it read:
Code:
DSsmtp.zoho.com
and then re-start Sendmail and see if it works. There should be no way at all that Sendmail can ignore your smart relay then.
Again, normally this is about as far from recommended procedure as it's possible to get, but since your Sendmail macro is somehow already broken anyway, you don't have much else to lose at this point by hand-hacking your sendmail.cf.
Oh, and one important thing: if you're going to do this, back up your sendmail.cf first !
Hmm, I’m afraid I’m not really sure why you’re having this problem of your config not building correctly. At least we can be sure your Sendmail isn’t masquerading as zoho.com or anything like that, so all it should need (all other things being equal, anyway) is the smart relay actually getting set.
Now, I wouldn’t normally recommend this these days, but it is possible to edit the sendmail.cf file directly. This is usually a bad idea for two reasons: firstly because it’s a lot easier to get things very badly wrong, and secondly because it puts the config out-of-sync with the macro, but that already seems to be broken anyway for some reason.
So, you could always try changing the DS line in your sendmail.cf so that it read:
Code:
DSsmtp.zoho.com
and then re-start Sendmail and see if it works. There should be no way at all that Sendmail can ignore your smart relay then.
Again, normally this is about as far from recommended procedure as it’s possible to get, but since your Sendmail macro is somehow already broken anyway, you don’t have much else to lose at this point by hand-hacking your sendmail.cf.
Oh, and one important thing: if you’re going to do this, back up your sendmail.cf first !
I took a backup of sendmail.cf and then edited sendmail.cf using vi editor.
Added DSsmtp.zoho.com
Code:
grep ^DS /etc/mail/sendmail.cf
DSsmtp.zoho.com
I then restarted sendmail service as below.
Code:
service sendmail restart
Restarting sendmail (via systemctl): [ OK ]
Once restarted i tried sending the email using the command
Code:
echo "httretrtr" | mail mohtashim@techx.com
but it still DOES NOT work.
I am sharing the maillog hoping it may help get pointers.
OK, I’m starting to run out of ideas off the top of my head, but we’re not totally done yet. One further possibility: does your system believe that it is in fact smtp.techx.com or techx.com? That’s one remaining possible explanation here.
So, some commands it might be useful to see the output of now include:
That last one might not exist, but it might - if it does, it would be interesting to see the contents, and it might well be our culprit.
Basically, at this point we’re now attempting to determine if your system believes it is in fact techx.com purely on the basis of hosts file entries, and also we want to see exactly how your system is configured to resolve hostnames when it encounters them.
Beyond that, I’m not sure what else to suggest. I’ve never known a smart relay entry to fail to work. Either something more fundamental is over-riding the behaviour of Sendmail, or it believes that it is in fact smtp.techx.com, and so is actually behaving correctly, so to speak.
EDIT: One last thing. What IP does your system resolve smtp.techx.com and techx.com to be, and are they in fact the same IP as your system ?
Note: Although my server is techx.xom we are using a third party external smtp mail server i.e smtp.zoho.com (which listens on port 587 while port 25 timesout when you do telnet to smtp.zoho.com)
There is nothing like smtp.techx.com anywhere as we are using external mail server smtp.zoho.com
Now answering your query. Please find the output below.
Based on this i realized that the /etc/hosts of my other server [45.76.182.101] also contains 127.0.0.1 techx.com and 45.76.182.101 techx.com and as you can see in the output above the nslookup to techx.com points to the other server and not the server we are dealing with.
If i change my server's /etc/hosts file entry form techx.com to dev.techx.com and then restart everything and try sending the Mail
Code:
echo "hello" | mail mohtashim@techx.com
it still fails but this time i get the following error in the the maillogs.
I then used the following script to send the email for better verbose.
Code:
more test.sh
#!/bin/sh
TO=mohtashim@techx.com
# -i - do not treat special lines starting with "."
# -v - use verbose mode (provide SMTP session transcript)
# -Am - use sendmail.cf (do not send via localhost:25) - requires root privileges
/usr/sbin/sendmail -i -v -Am -- $TO <<END
Subject: Delivery test
To: $TO
Delivery test.
END
The output:
Quote:
[root@development_techx ~]# ./test.sh mohtashim@techx.com... Connecting to smtp.zoho.com. port 587 via relay...
220 mx.zohomail.com SMTP Server ready September 7, 2017 10:20:00 PM PDT
>>> EHLO dev.techx.com
250-mx.zohomail.com Hello dev.techx.com (45.77.141.129 (45.77.141.129))
250-STARTTLS
250 SIZE 53477376
>>> STARTTLS
220 Ready to start TLS.
>>> EHLO dev.techx.com
250-mx.zohomail.com Hello dev.techx.com (45.77.141.129 (45.77.141.129))
250-AUTH LOGIN PLAIN
250 SIZE 53477376
>>> MAIL From:<root@dev.techx.com> SIZE=66 530 5.5.1 Authentication Required.
root... Connecting to local...
root... Sent
Closing connection to smtp.zoho.com.
>>> QUIT
221 mx.zohomail.com closing connection
You have new mail in /var/spool/mail/root
Not sure is the bold red is concerning and a cause of failure.
Please suggest.
Last edited by mohtashims; 09-08-2017 at 02:46 AM..
Well done - yes, it was indeed the hosts file entry that would have been the issue. Now, your smart relay is working. But what this error indicates is that smtp.zoho.com requires you to log in or otherwise authenticate beofre you can send mail through it.
What this tells us is that smtp.zoho.com isn’t meant to act as a mail relay or smart host, but rather is just a server for customers to send mail through via a mail client. This is different from a server that can act as a smart host. The general idea of an SMTP smart host is that it takes mail from hosts that would otherwise be unable or unwilling to deliver mail straight to their target on the Internet via SMTP, and it deals with passing the e-mails on to their final destinations. This it would seem is not the configured purpose of smtp.zoho.com.
However, all is not lost. Sendmail can be configured to support this situation, by having a file that tells it how to log in to smtp.zoho.com. You will need a valid username and password for the Zoho e-mail service, and you’d also need to be sure that the maintainers of smtp.zoho.com would be happy for their service to be used as a smart relay. But if all of that is fine, then what you need to do is set up a file called /etc/mail/authinfo with the login details.
Now, one thing that worries me here is that your Sendmail setup for whatever reason seems to be largely ignoring your macro, and so unless /etc/mail/authinfo is already set up in your Sendmail configuration (and it very well may be - have a look and see if it’s mentioned in the .cf), then it’s going to be a very unpleasant job to hack this into working shape.
Anyway, the format of /etc/mail/authinfo (which would then need compiled via makemap hash /etc/mail/authinfo < /etc/mail/authinfo in the usual way) is:
This sets up authentication for smtp.zoho.com, with the specified username and password, and tells it to use plain-text authentication (which may or may not be right - you’d have to know what kind of authentication is supported for the Zoho SMTP service).
In short: without a working Sendmail macro this could be a lot of work to get up and running. A better bet here is to find another host on your network that can actualy be configured to act as a genuine smart relay for your domain, and to just set Sendmail up to use that host as its smart relay rather than this external service.
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09-07-2017
