Support » Plugin: Post SMTP Mailer/Email Log » test email ajax error

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  • Hi, I had the same error. Try to install the package php-json or ask your hosting provider for it. The problem disappeared after I installed it. Also, it’s a good idea to restart your web server (apache) after the package is installed. If it’s not this package, try other “default” packages which may be missing, like php-curl, php-gd and even php-auth-sasl.

    I also was getting this error. It went away after I disabled WP Mail SMTP Plugin which this plugin was replacing.

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