WordPress 4.3 and AutoTLS
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I recently updated one of the sites I manage to WordPress 4.3 and quickly discovered that Easy WP SMTP was no longer working.
After some testing, I discovered that WordPress 4.3 updated PHPMailer to 5.2.10 which has a new option of “SMTPAutoTLS” which is true by default. This option can result in SMTP using TLS even if you select “None” as your encryption type.
I was able to modify the plugin to set this option to false and Easy WP SMTP began working again. I believe this plugin needs to pass this as false within the code or provide an option in the admin area to disable this feature.
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