Hi. I experienced something similar: On the day after the upgrade to WordPress 5.9 the plugin stopped sending. An email authentication failure appeared in the log of the plugin.
In this particular case, the email address used for authentication was a forwarding address only and without any mailbox. Before the upgrade sending worked fine using this address.
The solution was to create another email address with a mailbox and save its credentials in the settings of the plugin.
I didn’t try the wizard config.
@sankari I suggest using another plugin. I migrated to another plugin. The author of this plugin has abandoned it.
@themefour @sankari Hi,
We are looking into this issue, we will test, fix and release our latest version asap.
Sorry for the inconvenience.
Thanks
Hi @arsalantariq,
Thanks for the info and for looking into it.
Hi @sankari @themefour
We have released the beta version, which includes the fix of this issue, it would be great if you download this version and let us know how it’s working for you.
You can download Beta Version from here.
Looking forward to your response.
Thanks`
Hi @arsalantariq
Thank you for releasing the beta. I tested the installation and the wizard. When finishing the configuration settings this is the error I get:
Notice: Undefined index: fallback_smtp_password in /home/httpd/vhosts/client/domain.tld/wp-content/plugins/post-smtp/Postman/PostmanInputSanitizer.php on line 155 Warning: Cannot modify header information - headers already sent by (output started at /home/httpd/vhosts/client/domain.tld/wp-content/plugins/post-smtp/Postman/PostmanInputSanitizer.php:155) in /home/httpd/vhosts/client/domain.tld/wp-includes/pluggable.php on line 1355 Warning: Cannot modify header information - headers already sent by (output started at /home/httpd/vhosts/client/domain.tld/wp-content/plugins/post-smtp/Postman/PostmanInputSanitizer.php:155) in /home/httpd/vhosts/client/domain.tld/wp-includes/pluggable.php on line 1358
@sankari
Can you disable your plugins one by one and see if this issue still exists?
In meantime, I am also looking into this.
Thanks
@sankari
I tested the Gmail, Gmail API, and MailGrid with both PHP Versions 7 and 8, No issue was found, It could be a plugin conflict.
