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Tag Archives: email

DKIM/Domainkeys signing via DKIMproxy

Posted on May 14, 2011 by cyberx86
2

With the ever increasing volume of SPAM being transmitted, many email services look toward more elaborate ways to authenticate email. Beyond the obvious – content – two commonly used methods (perhaps with some variations), include sender policy framework (SPF), and … Continue reading →

Posted in: Systems Admin Tagged: dkim, domainkeys, email, postfix, spam

Using Telnet with an SMTP Server

Posted on January 27, 2011 by cyberx86
9

Despite having been around for a long time, telnet is an invaluable tool for testing a mail server. It allows one to pinpoint errors in the process – some which are not logged – and to quickly validate that things … Continue reading →

Posted in: Software, Systems Admin Tagged: email, postfix, smtp, telnet

Decoding a Base64 Email Attachment

Posted on November 20, 2010 by cyberx86
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I had a few files containing email attachments that needed to be converted into usable files. The following code (which has no checks in it), did the trick: <?php function decode_email_attachment(){ $data= file_get_contents($inputfile); file_put_contents($outputfile, base64_decode(str_replace( “\r\n”, “”, $data ))); } … Continue reading →

Posted in: Code Snippets Tagged: base64, email

Basic Email Analysis

Posted on November 18, 2010 by cyberx86
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Despite ever increasing security, it appears that email accounts are breached more often now than ever before. Quite possibly this comes down to the user as opposed to the email service itself. The focus of this article includes distinguishing between … Continue reading →

Posted in: Internet Tagged: dkim, domainkeys, email, spf
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