SMTP authentication means logging in to the outgoing server with your username and password when sending email. If it is off, your emails are not sent and you usually see a 550 Relaying denied error.
In short
- Authentication must be on for the outgoing server (SMTP).
- The username is your full email address and the password is your email password.
- Use the same details as for the incoming server.
Turning it on in Outlook
- Open File > Account Settings > Account Settings.
- Select your email account, click Change, then More Settings.
- On the Outgoing Server tab, tick My outgoing server (SMTP) requires authentication.
- Choose Use same settings as my incoming mail server and save.
In the new Outlook this setting is under Settings > Accounts > Email accounts > Manage; when you add the account as IMAP, authentication is on by default.
Turning it on in Thunderbird
- Go to Account Settings > Outgoing Server (SMTP).
- Select your server and click Edit.
- Authentication method should be Normal password and User Name your full email address.
On phones
On iPhone and Android, don't leave the username and password fields empty in the outgoing server settings. Step-by-step guides: Android · iPhone
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