I want to introduce a malware scanner that really convinced me: ISPProtect Web Scanner. The scanner is designed for the monitoring of web pages and is distributed by the company ISPConfig UG, which also develops the OpenSource-Project ISPConfig. The different licenses are based on the desired use (only one server […]
To send emails with Postfix, a few things have to be considered. These are either defined in RFCs or generally useful. 1. matching reverse DNS RFC1912 requires that the PTR record and the A record in DNS match. On the one hand it shows that the administrator understands the RFCs, […]
Debian / Ubuntu prefer to use IPv6 DNS Records. This leads to problems if the server supports only IPv4. The problem can easily solved. We only need to change the config for getaddrinfo(). Open /etc/gai.conf and change #precedence ::ffff:0:0/96 100 to precedence ::ffff:0:0/96 100 For me it was line 54.
A new version of the DKIM-Patch for ISPConfig is available now. Download: DKIM-Patch Changes to 1.1.5: allow the admin to change txt-records for dkim, dmarc and spf directly fixed fr-language for the resync-tool fixed regex for spf-includes
I have already described in DMARC Record (Domain-based Message Authentication, Reporting & Conformance), how to set up a DMARC record and why this makes sense. Now we need to pay attention to such DMARC record in the delivery of mail. The verification of a DMARC Records requires valid SPF and […]
The script wp-spamreport.php (as a download here in my git) reports at any time the spam comments of the last 48 hours to blocklist.de. It does not matter when a comment was marked as spam (manually or automatically by example Antispam Bee), but only that the comments are posted in […]
I use SPF records for many years. My implementation of SPF records in ISPConfig occurred to me to point out the advantages again. SPF is an authentication method that is stored in the DNS. This entry specifies which server can send mail for a particular domain. And why do I […]
The configuration directory / etc should be versioned for documentary reasons and for backup. All changes are visible at a glance and a previous state can be restored easily. In / etc are also security-related information. Therefore, care should be taken when transferring and backup the repository on encrypting and […]