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Is anyone using an anti-spam gateway service?

Posted: Thu Aug 23, 2018 4:35 am
by davidkillingsworth
I manage Zimbra servers for a few customers that typically in the SMB/SME range of 100 mailboxes or less.

I've tried fine tuning the anti-spam configurations as best I can for the past few years, but there is still quite a bit of spam that gets through. The things I'm worried about most are the phishing attempts that are increasingly looking more and more convincing.

I have tried to train users to be wary of emails from unknown senders that ask them to enter credentials and warn of mail accounts closing, etc.

In a previous company, we used Message Labs, which has long since been acquired by Symantec, but it's not really priced for SMB/SME range.

What do you use as anti-spam/anti-malware gateway services?

Thanks in advance.

Re: Is anyone using an anti-spam gateway service?

Posted: Thu Aug 23, 2018 12:36 pm
by L. Mark Stone

I wrote most of the Zimbra Anti-Spam wiki back in 2014, but you are right that this is a job for a third-party service. In my previous company we used Barracuda virtual appliances, but even their per-mailbox cloud service is not very affordable for smaller companies, especially given the limited feature set.

Earlier this year I did a bakeoff over more than four months testing various offerings from Barracuda, Symantec, Proofpoint, Email Laundry, Cisco, Sophos and others. Also, after talking to my customers and others it became clear that even SMBs who were concerned about security wanted more than just anti-spam. They wanted email encryption and if they were in a regulated industry like healthcare, or if they had sensitive or personal data, they were concerned about compliance DLP. Long story short, I settled on a cloud offering from Mimecast and became a partner.

Mimecast offers bundles of features, each bundle at different price points, covering email security, compliance and continuity. Gartner has a review of more than a dozen companies in this space you can see here: ... l-gateways.

Just because Mimecast was right for me and my customer base doesn't mean it will be right for you and your customers. But the Gartner link above will at least give you a short list from which you can do your own bakeoff. FWIW, Email Laundry was my second choice.

Hope that helps,

Re: Is anyone using an anti-spam gateway service?

Posted: Thu Aug 23, 2018 4:40 pm
by axslingr
We use Spamwall since the beginning of the year. Very happy with the service and support has been awesome when we've needed it for minor questions.


Re: Is anyone using an anti-spam gateway service?

Posted: Fri Aug 24, 2018 9:28 am
by Klug
We're using a mix of solutions, depending on the end-customers.

Either internal MailCleaner appliances (Community version) or SpamExperts hosted services.

Re: Is anyone using an anti-spam gateway service?

Posted: Wed Aug 29, 2018 7:31 am
by davidkillingsworth
Thanks for all of the responses.

I posted something similar to Reddit and got the following responses.

Sophos UTM firewalls

I thought I would list them here for further discussion and to enlighten anyone else who comes looking for a solid answer and sees this thread.

Has anyone used any of these services and has any feedback on service and/or pricing?

Re: Is anyone using an anti-spam gateway service?

Posted: Thu Sep 13, 2018 12:56 am
by tonyg
I'm a sole-proprietor with about a dozen domains and no more than a few accounts/aliases each. I Really dislike spam and came to Zimbra in my quest to get more control over filtering, and other aspects of server maintenance unsatisfied by commercial hosts.

Given this VERY modest usage (not even qualified as SMB), I'm also Very interested in finding multiple free and low-cost solutions to integrate with Zimbra for spam, malware, phishing, etc.

I need to make time to check out Rspamd, but that's only one piece of the puzzle.

SpamWall has a Lite solution for $39/month that would serve my needs. But really, with all of the monthly subscriptions in the world today, yet another $39 each month is really tough to swallow. At this moment I'm not hosting email for others, and would not pretend to be competent to do so. That means I can't expense this or recover it with revenue as a cost of business. This is a very tough position - poor email hosting services, and when we go DIY it just gets more expensive.

MailCleaner reviews are mildly compelling. The SourceForge FOSS project looks under-maintained and under-used. doesn't show pricing ... and if you go to you're in for a surprise. :)

Pricing for MimeCast and others? *sigh* we need to hunt around, request quotes... I don't see a comparison yet that includes pricing. Yeah, that's what we need in this line of work - more time-consuming research. :o

SPAM email generating from my Emails causing IP Blacklisting

Posted: Thu Sep 13, 2018 7:26 am
by asif.junaid
Hi All,
I am new bie here and too much worry due to spam emails generating from email accounts automatically and are sending to multiple addresses itself.

Due to this issue, IP address of my Email server is being blocked by most of Email providers like Gmail, Hotmail, Yahoo and others.
However, it is going fine to my organization's internal email addresses.

Kindly guide me how to resolve this issue as many of important emails are bouncing back from external servers.


Re: Is anyone using an anti-spam gateway service?

Posted: Sat Sep 15, 2018 4:32 am
by PaperAdvocate
I like ASSP (free, opensource, a bit involved to setup but beautiful to see work):

We host ours on a Linode. It also has the capability to sync settings between 2 different installs so you can have a backup mx as well.