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The system will generate a SHA1 hash based on the attached file and check this hash via a DNS lookup against the SMEOptimizer DNS server. If there is a match (A record), then the TXT record for this key provides a SHA256 and a filesize as well as Virus/Malware description. The SHA256 and size will be used to double verify the match and the description to provide a proper reject message in the qpsmtpd plugin.
The system will generate a SHA1 hash based on the attached file and check this hash via a DNS lookup against the SMEOptimizer DNS server. If there is a match (A record), then the TXT record for this key provides a SHA256 and a filesize as well as Virus/Malware description. The SHA256 and size will be used to double verify the match and the description to provide a proper reject message in the qpsmtpd plugin.
−If there is not match, then the SHA1, SHA256, file size and filename is stored in a local MySQL database. The SHA256 is checked up against VirusTotal and if there is a match then SHA1, SHA256, file size and filename will be sent to the SMEOptimizer server via a HTTPS PUT request.
+If there is not match, then the SHA1, SHA256, file size and filename is stored in a local MySQL database. The SHA256 is checked up against VirusTotal and if there is a match then SHA1, SHA256, file size and filename will be sent to the SMEOptimizer server via a HTTPS PUT request. VirusTotal only allows free checke every 15 seconds and therefore this cannot be done inline (within the qpsmtpd plugin).
A no time will any attachment content leave your local server and be shared anywhere.
A no time will any attachment content leave your local server and be shared anywhere.
