SPF fights return-path address forgery and makes it easier to identify spoofs.
Domain owners identify sending mail servers in DNS. SMTP receivers verify the envelope sender address against this information, and can distinguish authentic messages from forgeries before any message data is transmitted.
A significant majority of spam is forged. SPF allows mail servers to easily distinguish forgeries from legitimate mail. Importantly, SPF works before the message body is transmitted, saving the bandwidth cost of downloading the message and the CPU cost of filtering it.
In general, customers should report spam by forwarding a copy of the message including full header and body to abuse@usa.net.
Other options available:
Net@ddress - all users have the option to click the web-client's 'Submit-as-Spam' button which simultaneously updates USA.NET Abuse staff and our anti-spam vendors of the delivered spam.
CMS hosted domains - users have the option to click the web-client's 'Submit-as-Spam' button which simultaneously updates USA.NET Abuse staff and our anti-spam vendors of the delivered spam.
USA.NET web client:
Select Forward as Attachment to send the entire message to us.
You can also view headers by selecting a message and choosing the Show Headers option.
Thunderbird:
Use the Message > Forward As Attachment option to send the entire message to us.
You can also view headers by selecting a message and choosing the View > Headers > All option.
Outlook desktop:
Look for a Forward as Attachment option to send the entire message to us.
You may also view headers by selecting a message and choosing the "..." menu and selecting View > View Message Details.
Outlook on the web:
Select Forward as Attachment to send the entire message to us.
You can also view headers by selecting a message and choosing the "..." menu and selecting View > View Message Details.
Other:
Consult the documentation for your client software.
USA.NET is not a bulk/mass email provider. Email such as advertisements, solicitations, newsletters, community/public service announcements and similar are a separate email industry. USA.NET authorizes only bulk email that is transactional* as defined by the Can-Spam Act as it doesn't require the same maintenance as opt-in email. Customers must contact Support for access to this server pool.
* Transactional is email between a business and its customers that is required to maintain the business relationship such as invoices or account status change notifications.