Tag Archives | email security

Did you know? Zimbra Postscreen provides additional protection against mail server overload

In Zimbra you can optionally enable Postscreen as an additional Anti-SPAM strategy. Postscreen will offer additional protection against mail server overload. One postscreen process handles multiple inbound SMTP connections and decides which clients may talk to a Post-fix SMTP server process. By keeping spambots away, postscreen leaves more SMTP server processes available for legitimate clients […]

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Email Security Protect your email account and data

Identity theft, fraudulent use of your credit card, ransomware… cybercrime is always evolving. There are some simple things you can do to protect your email data and accounts. How can you protect yourself from the most common and real threats like: Identity and credit card information theft Theft of proprietary data Precise phishing attacks Ransomware […]

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Zimbra S/MIME encryption whitepaper

Email messages and attachments can be intercepted as they are sent over the Internet. Many email providers support secure connections for incoming and outgoing email. However, the email protocol has a flaw: it falls-back to unsecure connections if an error happens. Zimbra supports S/MIME a standard for encryption and signing email. By using S/MIME encryption […]

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Zimbra Security and PCI DSS

Emails are accessible to most people anywhere and anytime. However, when it comes to handling sensitive data like credit card information, you need to rethink your messaging options. The Payment Card Industry Data Security Standard (PCI DSS) is an information security framework intended to help merchants and service providers protect credit and debit card transactions […]

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Configuring Fail2Ban on Zimbra

This article is a how-to guide on installing Fail2Ban to block attacking hosts using a null route or blackhole routes. This can help mitigate brute force attacks on Zimbra. Especially brute force attacks on SMTP are very common. Prerequisite: Fail2ban has been tested in combination with netfilter-persistent and iptables. If you use ufw or firewalld […]

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