MailChimp just posted how they sent 1.5 billion emails through their system on Black Friday. It was followed on Cyber Monday with 1.4 billion emails. You can read more about here:
Those are pretty impressive numbers!
The subject line of an email is important. When an email hits the inbox the from address and the subject line really determines if the individual is going to open the mailer. If the subject line looks suspicious the mailer may get deleted or marked as SPAM. Here are some things not to do.
SPF stands for Sender Policy Framework. Pretty much it is a basic form of email validation that can be done to check on incoming mail. To understand this a little bit better let us identify some email basics.