Posts Tagged “mail server”

While working on an upcoming article for QD I ran into an issue with the dnsenum.pl Perl script. I followed the process of installing the optional Perl modules and when I went back to test dnsenum it would no longer return any IP addresses. Instead of dnsenum returning actual IP addresses it was returning odd characters. It turns out there is some form of conflict between dnsenum.pl and the Net::DNS Perl module. Below I describe the dnsenum issue in more detail and provide a work around by manually downgrading the Net::DNS Perl module by hand.

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When clicking on hyperlinks that are set to open a compose email message on OSX the Mail.app application will launch. Since it is likely that your preferred email application is something other than Mail.app such as Mozilla Thunderbird, Opera, Microsoft Outlook for Mac, Postbox, Sparrow, or something else then you will want to change the default email client to your preferred email application. In my case I use MS Outlook for the Mac so I needed to set the default email client to Outlook. Use the directions below to modify the default application that opens to compose email messages.

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I recently updated a development server running CentOS and ran into various minor issues including one regarding postfix being compiled with MySQL support. The development server runs ISPConfig for various virtual hosts and after upgrading all the packages on the server which included Postfix I noticed errors in the maillog. Below I describe what the error was in more detail as well as how it can easily be resolved.

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If you are a system administrator you probably manage one or more email servers so things eventually will go wrong and need to be resolved as quickly as possible. It is beneficial to know how to troubleshoot email servers using telnet via a shell so you don’t have to rely on a GUI mail client. Below I describe how to login to an Exim email server using telnet, authenticate via SMTP authentication, and then send test emails. The below examples will be run from a terminal window on Linux however they should be very similar too running the commands from a Command Prompt on Windows 7 or any other operating systems using a terminal window or similar.

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I wrote a previous post regarding saving messages sent via POP3 accounts into Gmail’s sent items yesterday and it can be read here. To expand on that there is another option to accomplish the same goal which is to set your outgoing mail server as smtp.gmail.com and use your Gmail account settings to authenticate. This second option is probably better since it will standardize how you are sending mail at all times. and more than likely sending through Gmail is more secure than with a typical SMTP server depending on the SSL options offered with the SMTP server account.

One thing to watch out for if using this second option is duplicate messages in your IMAP Sent Items folder. This problem can be easily resolved by following the below steps.

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