5/2/2023 0 Comments Kerio connect message filterOther content rules), but inappropriate attachments are stripped. IfĮnabled, messages are still delivered (assuming the message gets by exe files, but other businesses usually wouldn't. If you are a programming house, you may need By itself, that isn't enough to be classified as spam, but it gives the message a good head start if it has other spammy characteristics.Īttachment filtering is also disabled by default because everyĬompany has different needs. I add two spam points if the sender matches. I put in networks like 60.0.0.0 (mask 255.0.0.0) which matches an Asian block. For example, I have an IP address group called "Out of Country". If you have no reason to expect any legitimate mail from IP addresses that originate in those countries, why not block those outright or add spam score? You can do that with Custom Blacklists. Some countries generate more spam than others. They have three levels of lists - I use Level 2 and add 2 points. Note that you must "Ask directly" for this one.įinally, consider UCEProtect. Once you have the account, add them like this: They'll ask for your DNS servers, but what they mean is the IP of the machine(s) that will be using their service - that would be the IP of your mailserver. You need to create an account with them, but it's free. HTML_MESSAGE: 0.001,T_REMOTE_IMAGE: 0.01,TOTAL_SCORE: 4.180,autolearn=noĪnother I added recently is. X-Spam-Status: Yes, hits=4.1 required=3.0 X-Spam-Status: Yes, hits=5.0 required=3.0 You'll see the results in the X-Spam-Status header: Of course you could increase it even more for super-conservative lists like GBUdb, but intelligent use of blacklists can really help block spam. So if you increased the spam score by just one point for a match from any of them, you hit four instantly for the spammer who has attracted everyone's attention. Two starts to get suspicious, but four is almost certain. One blackist might be a "false positive". If you found an IP address on four different blacklists, the chances of that NOT being a spammer are very, very low. Some are free, some are paid, some are good and some are sloppy, but consider this: There are many available blacklisting services. There's another advantage to adding spam score rather than blocking. You can override Spam score in "Custom Rules", but if you block at the black lists, it will never get that far. Whitelisting can be done by IP in the "Custom whitelist of IP addresses" section, but that only affects the Internet blacklists. If you block, you cannot whitelist with "Custom Rules". To set, but you do have to think about your legitimate needs for larger messages.īe sure to set blacklists to "Add Spam Score", not block. It might check for ability to do encrypted The most likely source of failed commands is someone exploring your server for weaknesses - an ordinary SMTP conversation shouldn't have Maximum number of failed commands in SMTPīy default, this is checked and set to three.To the number of users in your mail domain. If that's not an issue, leave it checked and set the limit Lists that (stupidly) list all recipients in the "To:" line. This can be an effective block against spam,īut it can also be a problem if you belong to mailing Maximum number of recipients in a message.Then you'd be smarter to put them in DNS and block anyone Would be if you had other mailservers within your network, but even Someone without a DNS name? The only possible justification Block if sender's mail domain was not found in DNS.See Limits tuning for Kerio Connect Mail server for more on this and other limits. Too low if, for example, your users have a lot of correspondence Make multiple connections for efficiency. Spam, but keep in mind that legitimate email can and will Maximum number of concurrent SMTP connections from.A legitimate server will try again later a spammer This is not going to prevent legitimate email it just temporarilyĭelays it. Quite quickly and could easily exceed 60 messages per hour. Issue or any other complex subject might bounce back and forth While this certainly can cut down on spam,īe careful here. Maximum number of messages per hour from one IP address.Under the Security Options tab for the SMTP server are See the bottom of this page for links to information about that and their current recommendation for blacklists etc. Important update : Kerio Connect now has a new (optional) anti-spam filtering service. Investigate and set all appropriate items. Kerio Mail Server has several configuration options to protectĪgainst spam email.
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