Why do I get the error : Error using sendmail (line 172) 530 5.7.0 Must issue a STARTTL command first?

I am using the sendmail command with gmail to send email , after updating my authentication details recently the sendmail command stopped working.

It happens mainly when I have attachments in my email.

Answer 1

[MathWorks Support Team]

This happens when sendmail tries to create a secure connection and send the email. By default the connection is plain text and the server expects the a secure connect. To make it a secure connection please add the following line to configure the sendmail command

 

props = java.lang.System.getProperties;
props.setProperty( 'mail.smtp.starttls.enable', 'true' );

This property sets the connection to be secure.