How to Solve SMTP Error 421 4.4.5 – Server Congestion Issues
Email is key for both personal and professional lives. But when an email doesn’t make it to its recipient, it can cripple the business, lead to missed opportunities, and ultimately loss of revenue. Server congestion, or SMTP error 421 4.4.5, happens when an email server is overloaded with incoming or outgoing email requests. This might […]
Fixing SMTP Error 421 4.4.2 – Bad Connection What You Need to Know
The most difficult part of creating email content and developing email marketing strategies is actually crafting the campaign right? Not really. If you are an email marketer or have done some campaigns, you understand that there is more to email marketing than simply creating content, strategizing campaigns, and then hitting send. You need to employ […]
The Science and Process of Warming Up Newly Created Email Domains
Crafting effective marketing email content is just one of the fundamentals that can make an effective email outreach successful. In the realms of email marketing the technical aspects are just as crucial as the marketing ploy; our research team devoted their time to understanding the best and most helpful technical factors that can help every […]
How SMTP AUTH Mechanisms Affect Email Deliverability and Security
SMTP Authentication (SMTP AUTH) is not only a fundamental mechanism that protects your emails against spoofing and phishing attacks. It also has a direct contribution to your email deliverability and brand recognition. Depending on how well you set up your SMTP AUTH you are less likely to experience SMTP errors related to authentication failures —potentially […]
SMTP Error 421 4.3.2 – Service Shutting Down Causes & How to Fix It
There are tons of SMTP related errors that an average email user can encounter. Some of them can be due to IP reputation concerns, while others are rooted and are likely the result of a temporary errors failure — retryable errors. One of these temporary errors is the SMTP error 421 4.3.2 (Service Shutting Down), […]
SMTP Connection Encryption: The Key to Secure & Reliable Email Delivery
One of the top channels of communication for businesses is email, which unfortunately makes it one of the prime targets of cyberthreats like phishing, data interception, and spoofing. Encryption is the answer. Without it, emails are transmitted as plaintext over the Internet where people can steal sensitive information. SMTP (Simple Mail Transfer Protocol) is the […]
SMTP Error 421 4.4.1 – No Answer from Host: What It Means & How to Fix It
The SMTP Error 421 4.4.1 – No Answer from Host error indicates that your email server is unable to connect with the recipient’s server. This is just one of the many problems that can deeply affect email deliverability resulting in delays or even undelivered messages. So what should an email sender do when this message shows […]
SMTP Retries and Deferrals: Understanding Email Delays & How to Fix Them
The main protocol for sending email is the Simple Mail Transfer Protocol (SMTP), which manages both the sending and routing of messages between networked devices. But the journey from sender to recipient can sometimes be rocky. This may also result in SMTP retries/deferred by the senders. Though these mechanisms are supposed to be able to deal with […]
Fixing Reverse DNS Lookup Failures Best Practices for Email Server Configuration
Email is an instrumental communication tool that finds its advantages in areas such as marketing, customer support, and other internal communication processes. Email marketing is considered as the “king of all marketing channels”, while email communication for both customer support and internal communication offers a non-time sensitive system allowing everyone without rushing too much of […]
SMTP AUTH Mechanisms Explained Choosing the Right Authentication for Secure Email Sending
Phishing attacks, and spam emails remain a continuous problem for many email users. One of the most notorious forms of email security issue is the unauthorized access or usage of a bad actor or a spammer towards an email. If this ever happened to you then that means that you probably have an issue with […]
