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Email authentication is a way to ensure that an email provider will be able to recognize the sender of an incoming message and fight spam and abuse. You can use authentication data to verify the source of any message that you receive. For example, if you receive a message from a big sender (like a financial institution, or a major email provider, like Google, Yahoo or Hotmail) that isn’t authenticated, this message is most likely forged and you should be careful about replying to it or opening any attachments.
More on authentication methods
SPF specifies which hosts are allowed to send messages from a given domain by creating an SPF record. You can publish an SPF record here.
DKIM allows the sender to electronically sign legitimate emails in a way that can be verified by recipients using a public-key.
If you're receiving mail
Recipients can use authentication to verify the source of an incoming message and avoid phishing scams. For example, if you see messages claiming to be from google.com, but are not properly authenticated as coming from google.com, these are phishing messages. You should not enter or send any personal information. Remember, Google will never ask you to send personal information.
You can view the authentication information by opening a message and clicking on the 'show details' icon below the sender's name.
• If a message was correctly DKIM signed, a 'signed-by' header with the sending domain will appear.
• If a message was SPF authenticated, a 'mailed-by' header with the domain name will appear.
• If no authentication information exists, you'll see a question mark icon next to the sender's name.
http://www.gmailhelp.co
More on authentication methods
SPF specifies which hosts are allowed to send messages from a given domain by creating an SPF record. You can publish an SPF record here.
DKIM allows the sender to electronically sign legitimate emails in a way that can be verified by recipients using a public-key.
If you're receiving mail
Recipients can use authentication to verify the source of an incoming message and avoid phishing scams. For example, if you see messages claiming to be from google.com, but are not properly authenticated as coming from google.com, these are phishing messages. You should not enter or send any personal information. Remember, Google will never ask you to send personal information.
You can view the authentication information by opening a message and clicking on the 'show details' icon below the sender's name.
• If a message was correctly DKIM signed, a 'signed-by' header with the sending domain will appear.
• If a message was SPF authenticated, a 'mailed-by' header with the domain name will appear.
• If no authentication information exists, you'll see a question mark icon next to the sender's name.
http://www.gmailhelp.co
