Archive for January, 2017

SPF Surveyor

January 30, 2017 No comments

The SPF Surveyor is an SPF diagnostic tool that presents a graphical view of SPF records. The graphical view allows people to quickly identify which servers are authorized to send on behalf of a domain. (Note that this diagnostic tool focuses on domain-level authentication and largely ignores the portions of SPF that deal with the local parts of email addresses.)

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Pulls results for e-mail queued on smarthost

Output looks like this:

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Outlook Oversized OST File Problem

Maximum .OST file size in Unicode is 20GB for Outlook 2007 and 50GB for Outlook 2010/2013/2016. By default the maximum size is set to 20GB. When the .OST file reaches or exceeds this limit, you will encounter one or more of the following errors:

Cannot open or load the OST file at all.
Cannot add any new data to the OST file.
Cannot synchronize the OST file with the Exchange server.
Various error messages during the synchronization process.

Adding shared mailbox in online mode

Registry Fix:
To proceed follow the steps below:

Open Registry: Start > in Search field type in “regedit” without quotes.
Navigate to HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook\PST for Outlook 2007, HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\PST for Outlook 2010, or HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\Outlook\PST for Outlook 2013.
Right-click on MaxLargeFileSize in the right pane > Modify > type in value in MB in Value Data box > Ok.
Right-click on WarnLargeFileSize in the right pane > Modify > type in value in MB in Value Data box > Ok.

Archives Above 20GB will start impacting performance.

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[NET] Domain Name System (DNS)

January 27, 2017 No comments

DNS stands for domain name system – It is one of the most frequently asked interview questions when applying for a job in Information Technology (IT).

DNS controls your domain’s website and e-mail configurations and settings. When someone visits your website/domain like, the DNS record controls which name server (NS record) it reaches out to resolve the destination. You can also think of DNS like a phone book for the internet or intranet (internal private network). DNS associates the IP with the domain name and host-names. Imagine remembering the IP address: when you can just visit or, its a lot easier to remember than IP Addresseses.

For example, reaches out to a name server (NS record) hosted by (see reverse dns lookup: Notice the nameservers points to,, and

DNS is made up of several elements which control different aspects of a domain name including the

  • name server
    zone file
    a record
    mx record
    and commonly text record
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    [PS] Import CSV and Run a foreach condition


    Exporting a foreach to CSV Example

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