Cannot E-mail Outside of my Domain

Nathan Riley
Nathan Riley used Ask the Experts™
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I'm able to send and receive e-mail from the email address that is within my domain.  I can also receive e-mail from people outside of my domain.  My problem is when I try to email anyone outside of my domain it never arrives.  I then find it in my mail queue manager within WHM.  Any suggestions?

I'm on CentOS with cpanel/whm.  I'm not sure what mail server it uses.
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Have you got SMTP Authentication enabled in your mail client?

Tried sending mail out using webmail?
Nathan RileyFounder

Author

Commented:
For some reason all of a sudden all the mail is now delivered and process is working.  Should I turn on smtp authentication within my cpanel along with the domain key for any reason?
Top Expert 2011

Commented:
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Domain Keys not being enabled won't be why your mail isn't sent

I always have SMTP Authentication enabled, and recommend it.  Mail delivery will fail (most easily recognisable is when people are able to email internally but not externally) if SMTP Authentication is enabled on the server but the option to supply the login details when sending an email is not enabled in the email client (eg, Outlook, Thunderbird, someone's smartphone etc).  Users often tell me they can send mail OK... because they tested sending an email to themselves or to a colleague on the same domain.

If you get mail stuck in the queue again you can look in /var/log/exim_mainlog to look for your message for clues, or using WHM click Mail Queue Manager in the Email section and click Deliver Now next to a stuck message - you'll see the reasons given why it's not delivered there too.  If you spend any time at all looking at the mail queue, the ConfigServer addon called CMQ is well worth installing.
Nathan RileyFounder

Author

Commented:
Ok, thanks for the answers.  I messed up on one description though.  It wasn't smtp authentication it's called domain keys and SPF.  Should SPF be turned on?
Top Expert 2011
Commented:
To reduce  SPAM sprayback  and bounced emails, I would recommend you turn SPF on.
Here is article for SPF setting
http://www.techtalkpoint.com/articles/setting-up-spf-records-in-cpanel-whm-and-namecheap/ 

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