Using PHP for Gmail email delivery, I hit a STARTTLS error. Debug sample:
220 smtp.gmail.com ESMTP code001
530 5.7.0 STARTTLS required. code001
I dealt with a similar issue a while back. I found that the problem was largely due to not explicitly specifying the TLS context when establishing a connection with Gmail’s SMTP server. I had overlooked some subtle configuration details in the PHP mailer setup. Adjusting the connection parameters so that the encryption was set to TLS with the proper port made all the difference. It took some extra debugging time to compare configuration settings with the Gmail documentation, but once I aligned everything properly, the system started working without any further issues.
hey, i also ran into this when using gmail smtp. my fix was double checking php.ini for the right cacert path and verifying tls settings for the connection. sometimes just bumping the openssl library version does the trick, too.
I encountered a similar situation in my projects and found that ensuring the proper stream context configuration in PHP was key. My first step was verifying that PHP had access to the appropriate certificate authorities to prevent handshake errors. I also examined the port configurations and ensured that any additional security settings matched those recommended by Gmail. This was not an issue of pure coding error but rather a misalignment in settings that could affect the implementation of STARTTLS. Adjusting these settings to align with Gmail’s requirements eventually led to a stable connection.