![]() ![]() Use a few strategies to ensure you’re making the most of your campaign. Using a tool like Mailjet’s Email Automation helps prevent throttling, especially when working with a smaller team or building up to a larger campaign. Once they trust you as a reputable sender (and not spam), you’ll likely experience less throttling. 5 strategies to prevent email throttlingĮvery ISP has a threshold when it comes to delivery. It may seem surprising, but email has a carbon footprint, and continually sending emails to someone who doesn’t want them does nothing good for the environment. Some people might unsubscribe from your emails. The server won’t block you until they see how your other recipients behave. If they’ve marked you as spam, you’re going into the spam folder. Though it may hurt, some people might not like your emails. This situation may lead to multiple bounced emails, which isn’t worth your time or effort. The end user’s mailbox is full, and you’ll likely experience a soft bounce until they clear some room. There isn’t much you can do in this situation. A closed port rejects connections and ignores data packets because it doesn’t know which application it needs to open the package. An open port is a TCP port number customized to receive data packets. You’ll receive an error code if the receiving server is closed. The receiving server doesn’t have any open ports ![]() The server might think you’re a spammer if you don’t have an established sending reputation. ![]() Spammers will flood a receiving server with emails in quick succession rather than sending them over a period of time. The receiving server doesn’t recognize your IP address Though this rejection is usually temporary, it slows down your campaign and gives you extra work. It doesn’t matter what type of email program you use – there’s always a chance you’ll experience throttling. ![]() It’s worth taking the time to learn how email throttling can change your marketing campaign. 5 causes of email throttlingĮmail marketing is one of the most effective drivers of digital traffic. The throttle is likely because you sent too many emails in a short period of time, but there are a few other reasons you might receive a bounce. You won’t connect to the server and will receive an error code, depending on which throttle cause has occurred. If you exceed the threshold set by your email service provider (ESP), your emails will be bounced back to you. Your emails are throttled when you receive detailed bounce messages from ISPs regarding your sending frequency. To detect this temporary blockage, if your provider doesn’t do it for you, you must analyze the SMTP error messages like: “Too many connections from your host.” How do you know if your emails are being throttled? For example, if you suddenly increase the number of emails you send, certain ISPs and webmails will block a portion of your emails. The parameters adjust automatically according to sending conditions.įor some ISPs and webmails, the number of accepted connections and the email volume limit may vary depending on your reputation and the number of emails you send. It’s impossible to optimize the parameters – they are configured by default. The email sending platform allows you to configure the parameters yourself. Depending on the email platform you use, you may not always have the opportunity to set these parameters yourself (which could be a good thing). The number of emails sent by each connectionĪccording to ISPs and webmails, these parameters can be used simultaneously or separately. The number of SMTP connections per minute or hour The number of emails sent per minute or hour The technique involves configuring several different parameters: As is the case with email deliverability, it’s a great idea to surround yourself with experienced folks who can redefine delivery speed to various ISPs and receivers. The average ISP and receiver use unique thresholds to control email flow and filter out bad emails. Throttling, at its core, is essentially rejection – unpleasant for everyone involved. This technique consists of carefully adjusting the speed of email/campaign sendings, respecting the filters of major internet service providers (ISPs) and receivers across the globe. Email throttling is one of the minor components of email deliverability. ![]()
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