![]() These third party services analyze incoming mail and classify them as spam or not-spam based on the sender’s server IP, message header, attachments, and more.Īlmost all mail servers refuse to admit mails marked as spam, and it shows the error “ 550 Email blocked“. Mail servers use 3rd party services such as SpamCop, MSRBL, JunkEmailFilter, etc. What causes the error “550 Email blocked”? It means that the recipient’s mail server rejected the mail from mx. because the spam filter at classified the mail as spam. The mail system : host said: 550 Email blocked by (in reply to RCPT TO command) I'm sorry to have to inform you that your message could not be delivered to one or more recipients. Here’s a typical bounce message: -Original Message-įrom: Mail Delivery System Thursday, J02:22 PM You should also make sure that encryption (SSL/TLS) is enabled on your device or email program. The next section explains the proper settings you should use.įor more information, please read this article describing how to enable SSL encryption in an email program, including a list of more specific articles that describe how to configure SSL encryption in the most common email programs (Outlook, Thunderbird, Apple Mail, etc.).Here at, our Support Engineers maintain and support servers of web hosts, digital marketers and other online businesses.ĥ50 Email blockedis an email bounce error that we usually see in Shared servers, VPS servers and Cloud Instances. Email access either without encryption and through the TLS 1.0 and TLS 1.1 protocols have become deprecated, meaning they do not meet current security standards. Access to our email servers by any of these methods will be disabled in order to protect your email communications. In order for the transmission of emails between your device/email program and our email servers to continue working, they must support the TLS 1.2 protocol or higher and encryption (SSL/TLS) must be activated.Ĭheck the documentation for your device or email program to see if it supports TLS 1.2. If necessary, update the software in question. The latest versions of the most common email programs support the more secure versions of TLS 1.2 and TLS 1.3. ![]()
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