Connect. Communicate. Collaborate. Securely.

Home » Kerio User Forums » Kerio Connect » Troubleshooting SPAM Problems
  •  
innovativecs

Messages: 9
Karma: 0
Send a private message to this user
I've been running Kerio for a few weeks now with about 10 users and on two occassions I've sent an email to have it bounce back becausing the receiving server says my spam score is too high. What general steps should I take to check this out?
Our domain host added a mail record that points to our static ip and then an mx record for mail so I think that is proper. Now we do have comcast business internet so maybe the range of IP's could all be tagged as spam since Comcast owns them??
Can I relay our mail through the comcast smtp server?
I understand I didn't provide a lot of details but I don't really want someone to just look at it and fix it I would rather someone tell me the basic steps to troubleshoot this.
Thanks!
  •  
sedell

Messages: 1168
Karma: 1
Send a private message to this user
It could be the Comcast IP caused your mail to bounce. Some blacklist services will list entire ISPs if they don't think the ISP has responded properly to spam complaints, so it's a possibility. The people who use those types of ISP blacklists tend to reject any address listed instead of adding to the mail spam score, so I would expect you'd get the returned mail with a rejected or blacklisted message rather than one telling you the score was too high.

It could also be a combination several other things causing the mail to get a high spam score. Some things you can check are:

  1. Make sure your internet hostname (at the top of the Domains screen in the KMA admin console) is set to a FQDN (fully qualified domain name).
  2. Make sure you have a PTR DNS record for the mailserver's IP address.
  3. The domain portion of your PTR record should match your internet hostname domain if possible (this isn't required, but some spam systems might score you higher if the domain don't match).
  4. Do you have an SPF record published? Check for one to make sure it's accurate.
  5. Check your mailserver's IP address to make sure it's not listed on any blacklists. This usually results in a rejection, but some systems are set to add to the spam score if a blacklist match is made instead of rejecting the mail immediately.
  6. Take a look at the message itself to see what it contains. I've had users complain their mail was being rejected, and it turned out it was rejected because the PO# they put in the subject contained 'XXX'. Also, check to see if it was sent with high importance, contained exclamation marks in the subject, or has sections with all capital letters.
  7. If users are using a non-standard or little known mail client, make sure it contains all of the proper headers.


That's not a complete list of reasons mail can get bounced or score high with a spam filter, but that's where I would start.

Scott
  •  
innovativecs

Messages: 9
Karma: 0
Send a private message to this user
Thanks for all the information Scott, I'll start going through that. Here's the actual message I received when I emailed someone that I was able to email until we switched to the kerio system from a hosted system:
554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means
  •  
sedell

Messages: 1168
Karma: 1
Send a private message to this user
That appears to be a blacklist. I'd start by checking there.

Scott
  •  
freakinvibe

Messages: 1529
Karma: 60
Send a private message to this user
Yes, you should test your mail servers ip address on

http://www.iptools.com/dnstools.php?tool=spam_db&user_da ta=127.0.0.1&submit=Check

Check for any red Black Lists.

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
Previous Topic: yum update to clamav?
Next Topic: help
Goto Forum:
  


Disclaimer:
Kerio discussion forums are intended for open communication between forum members and may contain information and material posted by members which may be useful in learning about Kerio products. The discussion forums are not intended to provide technical support for any specific product. Any information implied or expressed in the discussion forums is that of the posting member. Kerio is in no way responsible for the information posted in the forums, or its accuracy. Kerio employees may participate in the discussions, but their postings do not represent an offical position of the company on any issues raised or discussed. Kerio reserves the right to monitor and maintain the forums to promote free and accurate exchange of information.

Current Time: Fri Sep 22 12:00:46 CEST 2017

Total time taken to generate the page: 0.00422 seconds
.:: Contact :: Home ::.
Powered by: FUDforum 3.0.4.