In my experience, none of the 3 products is very effective...

SmarterTools would be better off abandoning all three and looking for a partnership with someone better (e.g. BitDefender, Kaspersky, Sophos, Fortinet or someone else...)

Basically, all three products are near garbage.

Either way, though, they're better than nothing...

Cyren is avaliable again.  More information will be released shortly on how it came about.

The approaches related to SPAM and Virus significant different but there can be some cross over and Message Sniffer can help with Virus's as well but its primary focus is SPAM.

Cyren and Message Sniffer are both good but when you combine them along with the SPAM features we provide in SmarterMail, you can achieve great things!

For Virus, I would use ClamAV and Defender which is already available in SmarterMail. 

Thanks Tim

But I remind you that window defender makes false positives in a pseudo-random way. I wrote it over and over again, even via ticket. It was confirmed to me by the development team. It seems to be necessary to do a double scan with windows defender but at the moment this functionality is not there. Then it becomes unusable. We can't start checking for false positives manually.

Look at this post

https://portal.smartertools.com/community/a95421/smartermail-virus-scanning.aspx where I summarized everything.

For antivirus clamav + secureinfo update is a great choice

I certainly will.

At the moment I use the 8451

I will update in september, for me june to september is maximum workload on mail server and not time for new releases

Thank you

Thank you very much for the responses!

@Gabriele, I see you are very active on these forums. What do you currently use for spam filtering?

I'm using Fortinet FortiMail (VM onpremise version), that is very good, but also expensive...

Now I'm starting to take a look at rSpamd to understand if it can be a good solution

Hi Tim, our Cyren Premium Antispam license has lapsed and we wish to renew it, is this possible now?  How do we do this?

--update-- 

Think i figured it out, adding Cyren to our existing license now. :)

--update--

How to activate Cyren in Smartermail now?

--update--
Solution:

--Smartermail > Licensing > Re-activate smartermail license > fixed--

Any product(s) can be put in front of SnarterMail as an incoming gateway.  I use three.   Filtering of  unauthenticated mail, arriving from the Internet, requires different strategies than filtering authentucated mail from your users.   Consequently, use of an incoming gateway has many benefits    Don't make your security depend only on the features embedded in SmarterMail. 

Douglas, I agree with you.

I'm currently using antispam servers as incoming gateways, but they are getting outdated. I need a new solution that is easy to use and configure - I manage a ISP and don't have the time to keep analysing and configuring antispam systems, so I need something that is as close as possible to plug and play... The problem is that most antispam gateways are really expensive. That's why I'm looking at Smartermail's partners, because of it's ease of use and affordable price.

I have surveyed a lot of commercial products and found that none of them provide adequate solutions for sender authentication.   So I recommend a customizable environment for that function (Declude, Declude Reboot, Postfix, Python email module).  Then you can use an inexpensive appliance like Barracuda for proprietary content filtering.    

Good and cheap requires liberal quantities of elbow grease.

Hi Rafael!

I can suggest you 2 commercial AntiSpam solutions that work very well (even if both are a bit expensive...) which, once you learn how to use them correctly, are almost "set it and forget" (you will only have to take care of doing the first configuration for each new domain you add):

Douglas and Gabriele, thank you both for the recommendations!

I'll tell you my experience.

I don't have a big server

281 domains

1400 mailboxes

30,000 incoming messages per day on average

15% identified as medium and high spam

greylisting enabled

message sniffer + cyren antispam

I randomly monitor high spam and almost never see false positives

I don't see that many false negatives either

regarding the antivirus cyren zero our intervenes very little.

clamav update it with secureinfo adding the following db

DatabaseCustomURL https://www.securiteinfo.com/get/signatures/xx/securiteinfo.hdb

DatabaseCustomURL https://www.securiteinfo.com/get/signatures/xx/securiteinfo.ign2

DatabaseCustomURL https://www.securiteinfo.com/get/signatures/xx/securiteinfoascii.hdb

DatabaseCustomURL https://www.securiteinfo.com/get/signatures/xx/securiteinfopdf.hdb

DatabaseCustomURL https://www.securiteinfo.com/get/signatures/xx/securiteinfo0hour.hdb

DatabaseCustomURL https://www.securiteinfo.com/get/signatures/xx/securiteinfo.mdb

DatabaseCustomURL https://www.securiteinfo.com/get/signatures/xx/securiteinfo.pdb

Customers are satisfied, no one complains about excessive spam.

At the moment I don't need to increase the filtering.

Greylisting is a bit aggressive because it slows down deliveries, but I think it does its job. On some domains I disable it at the request of the customer.

An approach has always left me in doubt and I've always promised myself to go deeper but then I've never done it

Greylist Weight Threshold

Greylisting relies on the ip/sender pair telling the sending server I'm busy. And this happens before the smtp session allows the actual sending of the message.

But the spam score is calculated by analyzing the whole message and this happens after the message is received and after the smtp session is closed. So, I don't understand.

I add that maybe what I'm missing is setting the clamav (freshclam) update once an hour.

So make them update often DatabaseCustomURL https://www.securiteinfo.com/get/signatures/xx/securiteinfo0hour.hdb

But I haven't found how to do it

It seems to me that now it does it once a day

Thank you Sabatino!