Email Sent from my Domain for Non-Existent Email Addresses
Question asked by Cliff Hammock - 12/21/2015 at 2:41 PM
Answered
I started getting a lot of "delivery delayed" emails like the one below. 
 
The server(s) that the message "RE:" is attempting to be sent to has temporarily delayed the delivery for the following recipient(s):

identities@sbcgloal.net

There will be up to 12 more delivery attempt(s) of this message. Do not re-send your message until there are no more delivery attempt(s) and the messages bounces back to you.
 
But it shows the email is from  streetjeff@theforerunnernetwork.com  and this is not a valid email address on my SM installation. The domain is correct, but there isn't an account for that user. I currently only operate my mail server for my own business emails. I looked in my spool and there are hundreds of outgoing emails from addresses that don't exist on my server. I have tried to keep my SM install security updated based on the security settings recommended here, but something must not be right. I ran some diagnostics and it says rDNS is OK and it is not an open relay. 
 
I don't really have a good idea what the problem might be? But obviously this is a pretty bad thing that I need to resolve quickly. 
Employee Replied
Employee Post Marked As Answer
Hi Cliff.  Without viewing your logging details, I can't verify what's happening.   But to help, please check the following:
 
Also, in Settings >> Protocol Settings >> SMTP In tab, adjust your settings to these:
 
Allow Relay: Nobody
This will force all relay attempts through your SmarterMail server to authenticate first.
 
Require Auth Match:  Email Address.
This will require that the authenticated address matches the 'from to' address in the email.
 
For safe measure, I would bounce the SmarterMail service also.
If you're still experiencing an issue afterwards, please submit a support ticket and we'll look into this for you.
 
Cliff Hammock Replied
Thanks Rod. I had the Relay setup correctly. I changed the Require Auth Match to Email Address and no more problems. I deleted all the items in the SPOOL and no others have shown up. I don't see anything about that particular setting in the ST Online Help system, so I am not sure exactly what it does. But it did solve my problem and I really appreciate your guidance.
Dzung Huynh Replied
"For safe measure, I would bounce the SmarterMail service also."
Where do you actually do this step?
Employee Replied
Employee Post
Dzung, this is done within the Windows Services console. You can access this by accessing Start -> Run, enter services.msc and hit OK. Then locate the SmarterMail service, and issue a stop. Wait for mailservice.exe to terminate completely before starting it back up.

I hope this helps.

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