When adding an email account to your email client application, you will be asked to specify an Outgoing Mail Server or SMTP Server. This is the mail server through which you will send email. This server does not need to be the same as the mail server through which you receive email.
Ideally, your Outgoing Mail Server should be set to the same as your Incoming Mail Server, which means you will send and receive email through your web hosting account.
However, some Internet Service Providers will not allow you to send email through a different provider, such as your web hosting company. If you receive an error while sending a test email, here are two options:
Option 1: Enable SMTP Authentication and set an alternative SMTP port
In the same place that you specified the Outgoing Mail Server, you may find a way to set the port number of the Outgoing Mail Server / SMTP Server. In Microsoft Outlook 365, for example, you would go to File --> Account Settings. Then from the Email tab, click on your email account, then click on the Change... button. From the dialogue box that appears, click on the More Settings... button and then on the Advanced tab. Look for the setting under "Server Port Numbers" labelled "Outgoing server (SMTP)". Try changing the port number to 587 (instead of the default of 25.)
Then on the Outgoing Server tab, make sure that the checkbox labelled "My outgoing server (SMTP) requires authentication" is ticked, then "Use the same settings as my incoming mail server".
Option 2: Use your Internet Service Provider's mail server
If the above option does not work, change the port number back to 25, untick "My outgoing server (SMTP) requires authentication" (on the Advanced tab), and instead change the Outgoing Mail Server to the one supplied by your Internet Service Provider. Make sure that for the username and password for this outgoing server that you use your Internet Service Provider's account details.
Some common ones are listed below, but you should check with your Internet Service Provider if you are unable to send email with the suggested server listed below.
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