Tip & How-To about Computers & Internet

How to Tell If Your Mail Server Is an Open Relay for Spam |

Instructions Things You'll Need

  1. Lets assume that computer you are testing from is a typical laptop with windows on it. Take this laptop to a network that is not your own home/office network. For example, a Starbucks where you have a wireless account, or your friends house, or your house if you are testing your company's network (with their permission).
  2. 2 Go to the start button and click 'run'.
  3. 3 Type in 'cmd' and click 'ok'.
  4. 4 type: telnet YourServerName.com 25
    Note: "YourServerName" is a place holder for the server you want to check.
    You should see a header message of some kind, possibly starting with the number 220.
  5. Now type:
    mail from: someuser@theCompany.com (hit enter)
    (where someuser is a user at that domain, and theCompany.com is the domain that email gets sent from).
    You could also just test with a fake username/company, like god@god.com, but it may be blocked on such a superficial level. Best just to try with what the bad guys are going to do, which is send out email making it look to the world like it came from your company.
    If this step works, you should see "Sender Ok".
  6. Now type:
    rcpt to: your@emailaddress.com (hit enter)
    "your@emailaddress.com" would be the address that you want to try to test sending mail to. Ie., your personal email address.
    If this step works, you should see "Recipient ok".
  7. Now type:
    data (hit enter)

    Type in some random gobbly guk, then hit enter.
  8. Now type a single period (.) and hit enter. This sends the email off. If it worked, you shouldn't see anything saying relay denied, you should see a message starting with 221. You should also get the email that you just wrote, the body of which will be the gobbly guk from step 7.

Posted by on

Computers & Internet Logo

Related Topics:

Related Questions:

1 Answer

i cant put a wallpaper on my desktop

Instructions Things You'll Need
  • Laptop
    • 1 Right-click on the desktop to open the pull down menu. Be sure not to click on any icons when doing this as it will open a pull down menu for that specific folder or program.
    • 2 Scroll to the bottom of the pull down menu and click "properties." A "properties" window will open.
    • 3 Click the tab at the top of the window that is titled "Desktop". There will be an image of the currently displayed wallpaper and a selection box below.
    • 4 Scroll through the list of images to find a new image and click on it or click "browse" to select your own image from your computer and then click "OK"


Aug 26, 2011 | ASUS Computers & Internet

2 Answers

I have a Toshiba Tecra A-6EZ6312 and I can't get it to load up. When it is starting up it goes to a screen that says Intel (R) Boot Agent GE v.1.2.30 Copyright (C) 1997-2005, Intel Corporation CLIENT MAC ADDR: 0016 D4 26 65 5F GUID: VE313EBB 0EBF 11DB 8AC4 0016D426655F PXE=E53: No boot filename received PXE-M0F: Exiting Intel Boot Agent. Operating System not found. After it gets through all of that it just stays on that page

You neglected to mention if it has booted up in the past but considering the age of your computer, I'm assuming that it has.

More than likely your hard drive (HDD) has failed and you'll need to replace it and reinstall XP. The only other option really would be that you've got bad connections or that the interface between the hard drive and the HDD has failed. That's unlikely though because you wouldn't get a message about no OS being installed, you'd get a message about not having a HDD installed because your computer can't see it. A computer can still see a HDD even if its failed providing that it can still receive power and communicate with the motherboard. Before you do anything, though, pull the HDD with the power off on the laptop (one or two screws at the most) and battery and power supply disconnected. Then, power up the computer without the HDD. The System BIOS should recognize that there is no HDD installed and yell at you for it. Power down the computer, disconnect the power supply and the battery again and reinstall the HDD. Then power up the computer. That may solve the problem. If not, keep reading because we're going to need to test it before we make any decisions.

To confirm that it is a dead hard drive, you'll need to test it on another computer, preferably a desktop as it will be the easiest to do and hopefully won't require you to spend any money other than on a SATA cable (unless you already have one) just to test it. I've looked up the technical specs on your laptop and it came standard with an 80 GB SATA 2.5" HDD. Assuming that your using the same hard drive that came with the laptop, and your desktop has a SATA interface and power as well, you'll first need to disconnect the hard drive from your laptop . Now, if your desktop doesn't support SATA or you're using a second laptop to perform the test, stop right here and advance to the second section that covers performing the test on non-SATA desktops and second laptops.
SATA Signal Cable: captainhawk1_5.jpg

SATA Power Cable:
captainhawk1_6.jpg Connecting to a Desktop Computer that supports SATA Interface For the Purpose of the HDD Test:
The easiest way to tell if the computer supports SATA interface HDD is by looking at the HDD currently installed on the desktop. I always use non-conductive (latex, neoprene) gloves when I work inside of a computer to prevent static discharges that can destroy your computer. You should too.
Turn off the desktop, and disconnect power. Open the case. If the connections for that HDD are SATA, the cables that are connected to it will look like the examples above. If they don't, your computer does not support SATA so you'll need to stop and go on to the next section.
Now, you'll need a SATA signal cable (if you don't already have an extra one). You can get a SATA signal cable at any electronics or computer retailer. It shouldn't cost you more than $5.00. Next connect one end of it to the laptop HDD and the other end to the connection on the motherboard that will most likely be right next to where the SATA signal cable for the primary HDD is already connected to.
You shouldn't need to purchase a SATA power cable (indicated in the second picture) or a SATA to Molex adapter cable because your power supply should have at least one or two extra SATA connectors attached to it. If by some chance it doesn't, you'll need to purchase a MOLEX to SATA adapter cable (see the image below) and connect it to one of the several Molex connectors attached to the power supply (labeled with a "P" and a number. Example: P7). Again, this adapter should be easily acquired at any electronics/computer retailer and should be no more than $5.00 Now, connect the SATA power cable (or adapted cable) to the laptop HDD. You're now ready to do the test. Keep the case open when performing the test to monitor the laptop HDD and because, well... it's a heck of a lot easier than constantly opening and closing the thing and considering you'll have an HDD in there that's not mounted to anything, it's the safer bet. Skip the next section on connecting using a desktop computer that does not support SATA and go directly to the section on performing the test.

MOLEX to SATA Power Adapter Cable (may have multiple SATA connectors as well): captainhawk1_7.jpg

Connecting to a Desktop COmputer that Does Not Support SATA Interface (Supports IDE) or Connecting to Another Laptop For the Purpose of the HDD Test:
If the desktop computer you are using to perform the laptop HDD test does not support the SATA Interface or if you are using another laptop computer to perform the test, you are going to have to connect the laptop to the computer via USB interface. To accomplish this you will need a 2.5" Hard Drive Enclosure. A hard drive enclosure converts an internal hard drive into an external hard drive. They cost between $5 and $25 and you'll get a better deal online. Following the directions for the enclosure, connect your laptop HDD to your test computer. You should be able to easily tell if the drive is spinning up and the LED's on the enclosure should be flashing just like they do on a computer when a HDD is being accessed.
Performing the Test:
This is the easiest part of the whole show. If you haven't done it already, reconnect the power cable to the test computer and power it on. Go to My Computer on the desktop of the test computer (Computer if running Vista or Win7), double-click on it and a window will open. Once you find the laptop drive, double click on it and start searching around and see what you've got. If you don't see the drive, we've confirmed that the HDD has failed. If you do see the drive but open it up and there's either nothing on it or you get error messages when you attempt to access the folders, the hard drive has failed as well. In either case, you will certainly need to replace the HDD as I suggested in the beginning however, your data may still be retrievable. You'll need to get it to a local computer repair shop and get a quote.
On the other hand, if you can open up the files and access all of them, your HDD has not failed but, you have a very damaged Windows installation. This also may be reparable, but again, you'll need to get it to a professional to fix it. Before you do that, though, make sure to copy all of your important documents, photos, videos, etc., to the test computer's hard drive or onto the removable media (SD Card, Flash Drive, etc.) connected to the test computer.

Apr 28, 2011 | Toshiba TECRA A6-EZ6312 (PTA60U05T00F) PC...

1 Answer


This will walk through the steps to create a bootable USB flash drive for the purpose of installing a Vista or Windows 7 OS. These instructions assume that you have a computer with Windows Vista installed on it.
· USB Flash Drive (4GB+)
· Microsoft OS Disk (Vista / Windows 7)
· A computer running Vista / Windows 7
Step 1: Format the Drive
The steps here are to use the command line to format the disk properly using the diskpart utility. [Be warned: this will erase everything on your drive. Be careful.]
Plug in your USB Flash Drive
Open a command prompt as administrator (Right click on Start > All Programs > Accessories > Command Prompt and select “Run as administrator”
Find the drive number of your USB Drive by typing the following into the Command Prompt window:
list disk
The number of your USB drive will listed. You’ll need this for the next step. I’ll assume that the USB flash drive is disk 1.

Format the drive by typing the next instructions into the same window. Replace the number “1” with the number of your disk below.
select disk 1
create partition primary
select partition 1
format fs=NTFS
When that is done you’ll have a formatted USB flash drive ready to be made bootable.

Step 2: Make the Drive Bootable
Next we’ll use the bootsect utility that comes on the Vista or Windows 7 disk to make the flash drive bootable. In the same command window that you were using in Step 1:
Insert your Windows Vista / 7 DVD into your drive.
Change directory to the DVD’s boot directory where bootsect lives:
cd d:\boot

Use bootsect to set the USB as a bootable NTFS drive prepared for a Vista/7 image. I’m assuming that your USB flash drive has been labeled disk G:\ by the computer:
bootsect /nt60 g:

You can now close the command prompt window, we’re done here.
Step 3: Copy the installation DVD to the USB drive
The easiest way is to use Windows explorer to copy all of the files on your DVD on to the formatted flash drive. After you’ve copied all of the files the disk you are ready to go.
Step 4: Set your BIOS to boot from USB
This is where you’re on your own since every computer is different. Most BIOS’s allow you to hit a key at boot and select a boot option.
I used these instructions to get my new Dell Mini 9 laptop loaded with Windows 7 (the PDC bits). HTH.

Jan 23, 2009 | Computers & Internet

2 Answers

dell c640 laptop

Hrmm be nice huh, lets see, First you have to rip it all apart, kidding =)
I will assume you have been using this laptop prior to this happening.

Your computer is telling you it cannot find anything to start loading Windows etc
This is normally on your hard drive. If your hard drive fails or the system cannot find it, then it will give this message.
You can also use the CDrom to boot, but this is what you would use if there was a new hard drive without Windows installed.

This page will show you and give you full instructions on how to remove the hard drive. After you find it, do not remove it all the way, just slide it out an inch or so and then just slide it back in and put the screw back in.

Turn the laptop back on and see if that fixes the problem, sometimes they just need to be reseated.

Post bak your results and if it is still doing nothing we can try more things.

Apr 16, 2008 | Dell Latitude C640 P4 Mobile Notebook

1 Answer

problem connecting router to lap top

I'll assume you're using Windows XP with DHCP enabled and you're working with a new router that has not previously been configured. Please let me know if my assumptions are incorrect.

Try this:
- If you have installed Linksys software on your computer...uninstall it before using the rest of this procedure.
- Begin by shutting off the computer and the router
- Connect a Cat 5 ethernet cable from the network connection on your computer to one of the numbered ports on the router. Port 1 would be a good choice.
- Turn on the router and wait about 1 minute
- Turn on the computer and wait about 2 minutes after it boots up
- Click on Start>Run>...type "cmd" in the text box...>Ok
- The black command prompt window should appear
- Type "ipconfig" at the prompt and press enter...this will list your computer's IP Address, Subnet Mask, and Default Gateway
- If the ip address begins with 192.168.... things are looking good! If the address is blank or begins with 169, your computer is not talking to the router through the cable.
- Assuming "things are looking good" in the previous step, make a note of the default gateway address. It will typically be or something like that. This is the address of your router.
- Start Internet Explorer and type the router address into the address bar....for example, if the default gateway was, then type "" into the address bar of your browser.
- The router setup screen should appear...beginning with a login window. The username is usually "admin" and password "admin". If that doesn't work try leaving the password blank on the next attempt.
- Once you see the router setup screen you can proceed with configuring the router
to meet your needs. Use the instructions that came with your router (on disc?) as a
-I hope this is helpful....let me know if I can be of further assistance.

Jan 20, 2008 | Linksys Wireless-G WRT54G Router

Not finding what you are looking for?

1,096 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers


Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

Are you a Computer and Internet Expert? Answer questions, earn points and help others

Answer questions