Error at Windows startup – file system32\config\system is corrupted

In case that Windows startup screen says “specified file is missing or corrupt: \WINDOWS\system32\config\SYSTEM” does not yet need to panic and reinstall Windows. For some reason was damaged file WINDOWS\system32\config\SYSTEM (no, it is not a bug – it is truly a file without an extension, not a directory). Fortunately, Windows can create a variety of backup critical system files and have not forgotten on the abovementioned file SYSTEM.
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Posted in Windows Tagged with: , , , , , , ,

Verification / validation of email address

Occasionally we need to validate e-mail addresses without send a message to the recipient and wait for answer. For example, we can verify whether an email address given via a simple web form, is not a fake. The principle of such validation involves several steps:

  • verification of the existence domain (what is behind the sign)
  • verification of the existence MX record for the domain
  • connection to the SMTP server according to the MX record
  • communication is established according to the SMTP protocol and check the server’s response to the command RcptTo

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Posted in Miscellaneous Tagged with: , , ,