The SPF standard requires that any SPF record must comply with the 10-DNS-lookup limit. It means that any SPF record that causes more than 10 DNS queries is not valid, and any attempt to authenticate SPF for an email from the domain will lead to an error.
Email is a wonderful opportunity for businesses to promote their brand and get clients. From the other hand, email facilitates the spreading of spam, phishing, malware, viruses and other fraud simply because it is difficult to tell if the sender is really the one it pretends to be.
Legitimate senders have to wade through complicated anti-spam filters just to get their emails delivered to the destination user.
To help email senders deliver legitimate emails to the recipients and block phishing and fraud messages, a new email authentication standard was adopted by email senders and receivers.
A blacklist is a real-time database of IP addresses or domains that have been known to send spam or malicious content. Many Internet Service Providers consult the blacklist databases in order to filter emails sent to the users within their network.
The result of having the sending IP address or domain on a blacklist can vary from being a small nuisance to a complete block of your email campaigns.
Email infrastructure is the technical part of your email sending program which goes on behind the scenes and helps if set up properly, deliver the messages to the user’s Inbox.
Sending infrastructure refers to the domains and IP addresses of the servers you’re sending emails from, and email authentication refers to the methods you use to prove that an email sent by you is really coming from you.
A properly configured sending infrastructure and authentication greatly increase your ability to deliver the messages to the Inbox.
Businesses and companies don’t always give priority to their email marketing programs focusing on developing new products, setting up goals and planning the strategies. They often start optimizing the email programs when their open rates drop in times. But the success of the business is closely connected with the success of the email program. The more messages go to the user’s Inbox, the more revenue the company gets.
Hotmail was one of the first web based email services launched in 1996. It was rebranded as Outlook.com in 2013 to align with Microsoft’s desktop email application Outlook. At present, Outlook.com is one of the leading global mailbox providers with 400+ million active users.
Deliverability to Outlook.com and Hotmail.com domains concerns a lot of email marketers as Microsoft has the strongest filtering system which often times sends quite legitimate emails to the spam or junk folder.