Knowledge Base

Generally emails are directly delivered to the destination server. However, if the delivery attempt to the destination server is returning a temporary failure, all email sent to known valid recipients are queued locally on the filtering servers for delivery retry. Emails which have been permanently rejected by the destination server with a 5xx error code, […]

For users with multiple domains we offer our free domain aliasing feature where domains can be added directly in the SpamPanel. This means that every email sent to one of your domain aliases will be sent to the same user on your main domain. Users can access the Domain Aliases feature from the Domain Level […]

What is DMARC DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email protocol designed to help prevent email spoofing when used in conjunction with SPF and/or DKIM and gives sending domain administrators the ability to act on messages when the criteria is not met. DMARC also provides the tools for senders to monitor the […]

The nettigritty’s Antispam Cloud system fully supports incoming connections protected using TLS. Deliveries are always made over TLS when supported by the destination mailserver (opportunistic TLS). This way email is securely transmitted when possible. If you want to enforce TLS, then this needs to be explicitly set. When you contact support for enforcing TLS, please […]

The filtering methods and system of nettigritty’s Antispam Cloud have been specifically designed to avoid false positives. For that reason many different checks are performed to avoid making mistakes based on only a single classifier. Two levels of filtering can be distinguished. Filtering at the “SMTP level” and filtering at the “DATA level”. Thanks to […]

If you are still receiving spam, submitting the emails to the central nettigritty’s Antispam Cloud training system will, first of all, help to reduce the spam you’re seeing and it will allow us to retrieve detailed information on what may be causing your problems. Emails that did not pass our filtering systems, or that passed […]

Viruses, malware and other online threats often spread via email, therefore it is important to virus-scan emails before they arrive to the mail-client of a user. nettigritty’s Antispam Cloud actively blocks both spam AND its malicious attachments such as viruses, malware, ransomware, spyware and so on. Pre-virusscan blocks Due to the fact that viruses generally […]

Even though you may using our anti-spam system correctly, it is possible you are still receiving spam. This page explains the steps to determine why you are still receiving spam messages, and how best to resolve this issue. Check whether your MX records are correct To prevent spam effectively, your MX records should ONLY contain […]

With nettigritty’s Antispam Cloud you can block a very large amount of malware, yet there can sometimes be new Malware campaigns that are able to evade all Antivirus and Anti-Spam filters. Due to this we would highly recommend to enable the “Block attachments that contain hidden executables” option by default for all your domains. This […]

AOL Email The email files are in an html format. The objective is to save the file in html format. This can be done as follows: Open the email message you want to save, as if you were reading it – Near the top, at the bottom of the To: / From: section, click on […]

On our Hosted Cloud solution, we by default follow the EU data retention policy, and make the meta-data of connections available via the control panel for 32 days. For compliance a copy of the logging data may be stored up to 365 days, this data is only accessible in case of a (valid) legal request.

To route the incoming email for your domain through the SpamExperts filtering cloud you have to change your MX records. Prior to changing the MX records, it is best to check your TTL. We recommend a maximum value of “3600” in order to propagate any DNS changes faster. Higher TTLs can lead to spam not […]

To avoid spammers being able to directly deliver the spam to your mail servers without filtering it first, you have to make sure your mail server only accepts emails originating from the filtering system. To only accept messages from your filtering nodes you need to allow emails based on your delivery hostname(s) or IP(s) . […]

Incoming Using telnet you can manually test if the destination server is correctly accepting the email. To do so, you have to lookup the destination route in the SpamExperts Control Panel set for a domain, and try delivery: demo1.spambrand.com:~$ telnet destinationserver 25 Trying x.x.x.x… Connected to destinationserver. Escape character is ‘^]’. 220 destinationserver ESMTP helo […]

We apply an advanced form of greylisting to help and stop a significant amount of spam with minimal resource usage. Although greylisting is a controversial technology, it is still highly effective when applied properly. First of all it’s important to mention that all nodes within the cluster are synchronized, and aware of the connections made […]