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Is this in any way a threat? No. Your server correctly rejects the mails before they reach your server (the spammer only greeted), so only minimal resources are used and you can just ignore it. How can I stop this person? By blocking such attempts if they do it too often, e.g. using fail2ban, which you can install via package management. It is used ...


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Regarding security, usually such connection attempts are just made by automated spam bots operating from malware contaminated PC. In all case it seems that these requests are correctly rejected by your server. I recommend you to check SPAM protection measures to protect your mail server, and in particular I recommend you to setup a check toward SpamHaus ...


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These records show that this sender is trying to relay mail through your mail server. But fortunately, your mail server is not setup to allow open relaying, so that's preventing these attempts from succeeding. If this mail server is only being used to send outgoing mail, and is not being used to receive incoming mail, then you may want to setup your ...


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It's probably a machine trying to use your mailserver to send spam. To answer your questions: The risk for you here is that, if he succeeds, your mailserver is going to be blacklisted as an Open Relay. You must configure your mailserver to accept connections on port 25 only from the hosts you want to be able to send mail. As an additional protection, ...


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No, malicious code in your PHP file is not a virus or a trojan. Most end user anti-malware tools do not scan for these types of things. The malicious actions in your web app may be legitimate commands that make sense in a different context. You may want to look into static code analysis tools which analyze code for software design errors.



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