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How to Easily Booting Windows 8 in Safe Mode?

When using previous Microsoft Windows version before Windows 8, there are some option to go while our Windows can not boot properly. At that version, we can press F8 to see some option for booting. But now when using Microsoft Windows 8, it will give other method to go to Safe Mode booting option.

Category : Computers (IT)

Error SMTP sending email "421 cannot connect to server"
Post by: admin

I always use Yahoo Plus SMTP server for my default SMTP server at my email client, and so far everything ok. But about 2 days ago, I wasn't able sending email from my email client software, I use Mozilla Thunderbird email client.

The error message when my email client can not deliver was:

421 cannot connect to server

I thought SMTP server at Yahoo have problem for temporary time, but at the same time I tried to connect my Internet connection using other Internet Service Provider, and the result is: my email client could easily send. Then I know the problem come from my Internet Service Provider.

I open Yahoo Email help to find out the solution for this problem. And thank you for internet information resource, because I've found solution that for SMTP server connection, usually they open standard 25 as default port and 587 as submission port. For some reason, some internet service provider block port 25, then we have to change our SMTP port become 587. After change my email client software SMTP port to 587 then it can deliver sending email again like before.

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