Troubleshooting

If you cannot send emails please make sure to check each step on this page.

If you haven't already, please follow the setup instructions for your email software. In particular, check the following:

1 SMTP Server

Check that the SMTP Server (the Outgoing Server) in your email software is set correctly. Your SMTP server is mentioned in your control panel. If you are unsure where to enter this, please refer to the setup instructions.

2 SMTP Username and Password

Check that you have entered your SMTP Username and Password in your email software correctly. You can find out which values you should enter by logging in.

3 SMTP Port Number

This is a critical check!
SMTP2GO works on ports 2525, 8025, 587 and 25. To determine if a particular port is blocked from your location, please do the following in Windows.
(Note: Windows 7/Vista users may need to install Telnet to perform the test below, as these operating systems do not come with Telnet pre-installed. To add Telnet in Windows 7/Vista, go to Control Panel -> Programs -> Turn Windows Features On or Off and check Telnet Client).

  1. Click the Start button, and then click "Run..." (Windows 7 users press WindowsKey + R).
  2. Enter "cmd" and press Enter.
  3. In the window that appears, enter "telnet smtpcorp.com 2525". If port 2525 is available you should see "220 smtpcorp.com ESMTP Exim..." appear after a few seconds. If this does not appear, then close the window and repeat the steps above, using ports 8025, 587 and 25. For example, to test port 8025 enter "telnet smtpcorp.com 8025".
  4. Now, enter the SMTP port number (that you have just determined is open) into your email software's settings.

In almost all cases using port 2525 will work, however some ISPs may block port 2525.

If none of the above ports is working for you then please try using the following setup:
SMTP server: port80.smtpcorp.com (if your regular SMTP server is smtpcorp.com) or port80.smtp2go.com (if your regular SMTP server is smtp2go.com)
Port: 80

Problems sending large attachments are normally caused by a slow upload speed, or poor internet connection at your current location.  You can check your current potential upload speed here: speedtest.net (then click 'Begin Test').
You can check your internet connection quality here: pingtest.net.
 At slow locations, we recommend sending a zip file of your attachments, or using sendspace.com.

Some devices (fax machines etc.) may benefit from using the IP address of your SMTP server instead of its name (i.e. 207.58.147.66 if your SMTP server is smtpcorp.com, or 207.58.142.213 if your SMTP server is smtp2go.com).

Finally, our controlled location setup often works in highly controlled locations (such as China).


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To contact us about sales, or if you have any general questions or comments, please head to the general contact page. We appreciate all feedback and will respond to any queries as soon as possible.

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Controlled Location Setup

This setup often works in controlled locations (such as in China). It gets around many problems that individual Internet providers, or states, implement in order to restrict SMTP traffic.

Change your SMTP settings to the following (note, if you are unsure what your 'usual SMTP server' is, login to your control panel to find out):

SMTP server: port80.smtpcorp.com (if your usual SMTP server is smtpcorp.com) OR port80.smtp2go.com (if your usual SMTP server is smtp2go.com).
Port: 443
And, turn SSL/TLS on.

You can also try the following:

SMTP server: your usual SMTP server.
Port: 465 or 8465
And, turn SSL/TLS on.

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