Once your AuthSMTP account is setup you can immediately use it with the email address you used to sign up - in addition you can then authorize additional email addresses (using our online Control Panel - login then click 'view / add email from addresses') to send mail 'from'.
All AuthSMTP accounts are allocated a minimum of 10 'from' addresses and larger accounts more (up to 300 on some accounts) - see our Pricing pages for specific details.
If you use a large number of email addresses at your own domain name we also offer the option to authorize an entire domain name - see here for details.
For more details on why we do this see How do you detect and stop SPAM / email abuse?
If you have any questions about this please contact us!
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