无法在 Laravel 中发送 SSL/TLS smtp 电子邮件

Question

My config:

PHP version: 7.4.5

Laravel version: 7

Swiftmailer version: 6.2.3

Observed behaviour

Swift_TransportException Connection could not be established with host... :stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed

Expected behavior

Working -> I think there was a breaking change in underlying libs and used encryption methods, cause I have systems where it is working with the exactly same swiftmailer version.

Example to reproduce

1. Install the latest Laravel 7.
2. Create proper configs and mails.
3. Try to send email with port 587 and tls enabled. Error: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
4. Try to send email with port 465 and ssl enabled. Error: Connection could not be established with host... :stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed

Please note that:

1. Configs are 100% validated and I can send emails from many different systems, but not using this library -> swiftmailer -> used_by -> laravel.
2. I've tried different smtp mailing vendors and the results are identical.

What am I doing wrong here?

Answer 1

The solution was really trivial.

What was needed to solve this problem, was to set up MAIL_ENCYRPTION to tcp in .env . instead of tls or ssl on corresponding ports.

For some strange reasons, setting tls (no matter version) or ssl , with proper ports didn't work.

Therefore, if you are experiencing these types of problems, please set MAIL_ENCYRPTION=tcp - this should solve your errors.

Happy coding...