![]() ![]() Most SMTP servers implement STARTTLS only on port 587. That your SMTP server supports the STARTTLS feature.If you get a StartTLS is Required error, check: In this example, the client has requested (EHLO) a list of features that the email server supports and the server has returned that it can use STARTTLS: 250-STARTTLS. In order to check that your email server supports StartTLS, open a command prompt and connect to it using telnet: telnet 25 The StartTLS command is used by both SMTP and IMAP (POP3 uses a different STLS command for encryption). When using STARTTLS, an encrypted connection is created right on top of a usual TCP connection instead of opening a separate port for encrypted connections. StartTLS is an extension of the SMTP protocol that allows telling the email server that the email client wants to use a secure connection using TLS or SSL. What Does the StartTLS is Required Error Mean? 5.7.3 STARTTLS is required to send mail” in the tracking log of Exchange Online (Microsoft 365): ![]() In our case, we saw an error “ 450 4.4.317 Cannot connect to remote server. In this article, we will look at how to fix the STARTTLS required error when sending an email. You may face this error in different apps (SQL Server, Jenkins), scripts, and programming languages (Visual Basic, PowerShell, Python, Java, C#). When sending emails from various applications or scripts, you may encounter error 5.7.3 StartTLS is Required to Send Email. ![]()
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