Can't send emails using email clients

Hi,

I'm unable to send email messages using Thunderbird/Outlook and my Gmail account.
I'm getting an SMTP error. My SMTP port is 587 using TLS autnentication. I've also tried port 25 with SSL authentication.

I've followed Gmail's guide when I configured my Gmail account on Thunderbird. Note that I can receive emails (via POP).

The other computer in our house is unable to send emails using email clients, too.

I've also followed a Gmail guide on SMTP errors. I've tried all of the suggestions, until I've come one that suggests trying a TELNET command. The command is unable to execute, too.

Here's the Gmail guide I was following: http://mail.google.com/support/bin/answer.py?hl=en&answer=78775

And here are the TELNET test's results:
http://i29.tinypic.com/33x9fkj.png

I was trying to fix this SMTP problem for nearly 2 years, but I've never managed to send even one email using an email client. I've also tried on Windows XP, Vista and 7. Hell ,I even tried Ubuntu's Evolution email client.

My ISP say they can't help me since I'm not using their email service, but Gmail.

And ideas on how to fix this problem once and for all?

Thanks in advance.

 

Can you send email to your ISP using SMTP? I don't do anything special for gmail, here's my SMPT configuration from Thunderbird.

 

What do you mean by "send email to your ISP"? What's the point in sending them an email?

BTW: My Thunderbird settings are as yours.

 

There was a recent change but first of all make sure you have checked "my outgoing server requires authentication".
Incoming port should be 995 and outgoing should be 465 and "this server requires and encrypted connection" should be checked also.

 

"My outgoing server requires authentication", "this server requires an encrypted connection" - Are you talking about Thunderbird, Rich-M? Cause I personally couldn't find these two options.

Alright, a little Googling had led me to understand that you're talking about Outlook. So, although I mentioned Outlook on my original post, I do not have it installed.

 

The settings shopuld be there I don't use Thunderbird so I don't know where but if should be in something liek "Tools" "Account Settings" and then "Advanced" not "Options".

 

My Thunderbird is configured just fine. I've tried many varieties, but they all don't work. Well, maybe they are not the problem, because I followed the Gmail Thunderbird 2 guide.

 

Well, blow me down! I hadn't sent mail via gmail for some time, and it didn't go when I tested it. I fixed it now, and I send and receive just fine using gmail with the following settings.

 

Hey I don't mind helping you for a change!

 

That's not working, either.
The port is probably blocked. How can I open SMTP ports (I only know about TCP and UDP)?

 

You don't have to open any ports for email, they're all outgoing ports. Can you send email to any SMTP server?

 

I'm not sure what you mean by that, but I can definitely send emails using the Gmail Web application.

 

Do you have any other email accounts, like with your ISP? If so, can you send email to them using Thunderbird or Outlook?

 

John: My brother knows the details of our ISP email account, but does it really matter who I'm sending the email to? Or perhaps you suggest using that email account to send emails from?

TerryNet: I only use Panda Cloud Antivirus. Turning Windows Firewall for both private and public network doesn't help.