SMTP (Email Sending) Errors
The most common email sending (SMTP) problems one encounters are due to one issue - spam email. Or, to be exact, the efforts of various ISPs to prohibit spam from being sent through their servers and to their customers.
Internet Connection doesn't restrict SMTP access as far as how many messages you send, the size of the messages or even how many recipients you specify. Instead, we simply require that access to our SMTP service be from accounts on our systems.
Usually customers will not even notice the measures we've taken to protect our SMTP servers from illegimate use but occasionally you might receive an error message upon sending email.
This leads us to the single most commonly encountered SMTP error:"sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"
If you try to send email and receive this error message, you were not authorized to use our SMTP services.
In order to get around this you have do one of three things:
- Configure your email client for SMTP authentication.
- Check your email account before attempting to send mail.
- Use your ISP's SMTP server.
Many email clients have a provision for specifying that your account requires SMTP authentication. To do this in Outlook Express for Windows, for example, you go to the "Tools" menu and select "Accounts". Then you choose your mail account and click the "Properties" button. On the "Servers" tab, near the bottom of the window, there's a section labeled "Outgoing Mail Server". In that section there's a checkbox for "My server requires authentication" and a button maked "Settings...". To enable SMTP authentication simply check the box. Next, hit the "Settings..." button and make sure "Use same setting as my incoming mail server" is chosen.
By sending your login and password to the server (by checking your mail account) you open up a 30 minute window in which you can send email.
Most Internet Service Providers (including ISDN, DSL and Cable access providers) provide SMTP servers that you can use. This leads us to the second most common email sending error:"no socket error/host unreachable"
If all the settings in your email client are correct, i.e. SMTP server is either YOUR-DOMAIN-NAME (Unix hosts) or MAIL.YOUR-DOMAIN-NAME (Windows hosts), and you recieve this error, the chances are that the ISP you use to connect to the Internet prohibits its customers from sending email through SMTP servers besides their own.
The only way to avoid receiving this error is to use the SMTP servers provided by your ISP.