[CentOS] Postfix (Roundcube client) sends mail, but not able to receive

Dear All
I have some basic doubts.

1. Do I need to run postfix like  /etc/init.d/postfix restart
2. What I found it , it is starting.., but when I check immediately ps -ef
| grep postfix, I do not see any postfix process running.
3. Is there any system config file, where I need to mention system need to
run postfix not sendmail....
4. If postfix is not running, how am I able to send mails out....

5. I read some "make sure port 25 does not relay mails", can somebody
explain more in this regard and how do I stop port 25 relaying mails...

My apologize for novice questions.

Regards
-Austin





On Thu, Mar 14, 2013 at 4:27 AM, Austin Einter <austin.einter at gmail.com>wrote:

> Dear Les Mikesell
> I  executed the steps you have advised.
>
> 1. MX Record Check
> [root at ip-173-201-189-43 necs14]#
> [root at ip-173-201-189-43 necs14]# dig -t MX netcloudjobs.com
>
> ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.2 <<>> -t MX
> netcloudjobs.com
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28659
> ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3
> ;; WARNING: recursion requested but not available
>
> ;; QUESTION SECTION:
> ;netcloudjobs.com.              IN      MX
>
> ;; ANSWER SECTION:
> netcloudjobs.com.       86400   IN      MX      0 mail.netcloudjobs.com.
>
> ;; AUTHORITY SECTION:
> netcloudjobs.com.       86400   IN      NS      ns2.netcloudjobs.com.
> netcloudjobs.com.       86400   IN      NS      ns1.netcloudjobs.com.
>
> ;; ADDITIONAL SECTION:
> mail.netcloudjobs.com.  86400   IN      A       173.201.189.43
> ns1.netcloudjobs.com.   86400   IN      A       173.201.189.43
> ns2.netcloudjobs.com.   86400   IN      A       173.201.189.43
>
> ;; Query time: 0 msec
> ;; SERVER: 10.0.0.1#53(10.0.0.1)
> ;; WHEN: Wed Mar 13 15:41:00 2013
> ;; MSG SIZE  rcvd: 139
>
> [root at ip-173-201-189-43 necs14]# clear
> [root at ip-173-201-189-43 necs14]#
>
>
> 2. A record check
> [root at ip-173-201-189-43 necs14]# dig mail.netcloudjobs.com
>
> ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.2 <<>>
> mail.netcloudjobs.com
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5672
> ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
> ;; WARNING: recursion requested but not available
>
> ;; QUESTION SECTION:
> ;mail.netcloudjobs.com.         IN      A
>
> ;; ANSWER SECTION:
> mail.netcloudjobs.com.  86400   IN      A       173.201.189.43
>
> ;; AUTHORITY SECTION:
> netcloudjobs.com.       86400   IN      NS      ns1.netcloudjobs.com.
> netcloudjobs.com.       86400   IN      NS      ns2.netcloudjobs.com.
>
> ;; ADDITIONAL SECTION:
> ns1.netcloudjobs.com.   86400   IN      A       173.201.189.43
> ns2.netcloudjobs.com.   86400   IN      A       173.201.189.43
>
> ;; Query time: 0 msec
> ;; SERVER: 10.0.0.1#53(10.0.0.1)
> ;; WHEN: Wed Mar 13 15:42:19 2013
> ;; MSG SIZE  rcvd: 123
>
> [root at ip-173-201-189-43 necs14]#
>
> I see in my firewall telenet/25 is blocked.
> However smtp/25 is allowed.
>
>
> Not sure how do I debug..., Any idea...
>
> -Austin
>
>
>
> On Wed, Mar 13, 2013 at 9:52 PM, Les Mikesell <lesmikesell at gmail.com>wrote:
>
>> On Wed, Mar 13, 2013 at 10:03 AM, Austin Einter <austin.einter at gmail.com>
>> wrote:
>> > Dear All
>> > Recently I just setup postfix, dovecot, roundcube etc in a dedicated
>> server.
>> >
>> > >From roundcuble, I am able to send mail to my gmail account.
>> >
>> > But from my gmail account, when sent mail to my mail id, that I setup
>> > recently, I do not see that email in roundcuble inbox. Neither that mail
>> > bounced back in gmail. Not sure, how do I debug this.
>> >
>> > Kindly let me know how should I proceed to fix this issue.
>>
>> First look in your posftix log to see if there has been an attempt to
>> deliver it.   If it hasn't gotten that far, make sure that your DNS MX
>> record is visible to the rest of the world and also the A record for
>> the name in the MX.   Then check that there are no firewalls blocking
>> port 25 either from the internet
>> service provider or your router, or your host.
>>
>> These are easiest if you have some outside account where you can:
>> dig -t MX your_domain.com
>> then
>> dig name_of_MX_host
>> then
>> telnet IP_address 25
>> and you should get an SMTP ready prompt from your postfix.
>>
>> If your domain name did not resolve in DNS at all, gmail should have
>> rejected it immediately, but it may resolve to the wrong address or
>> the connection may be blocked somewhere and it would retry for a
>> while.
>>
>> --
>>    Les Mikesell
>>     lesmikesell at gmail.com
>> _______________________________________________
>> CentOS mailing list
>> CentOS at centos.org
>> http://lists.centos.org/mailman/listinfo/centos
>>
>
>