Cannot send email with your email client such as Outlook? No worry.

Please, run the following test as your ISP may have blocked port 25 which is responsible for connecting to your SMTP:
1) open Start menu
2) click Run
3) type 'cmd'
4) in the console type 'telnet mail.yourdomain.com 25'
Wait a few seconds. You must see the following: '220 mail.yourdomain.com ESMTP'. This will be OK. If you do not see this message, your SMTP is being blocked.

In this case try the following:
- If you are behind a firewall, your web host company may be unable to authenticate you. If you have a personal firewall, try lowering the security.
- Call your ISP and ask if they block people sending through remote SMTP's.
- You can use your ISP's SMTP server. In your email client, put the SMTP server that you use to send out your ISP email, and your email will still appear with your domain name.

Hope this can help some of you who face this problem.