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Hi,
I have was not able to use your plugin because I have a site on a server that does a code review using PHP Code Sniffer first. I just wanted to let you know that some errors came back that I think would be pretty easy to solve. In multiple places this is the error we are seeing:
All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks)
an example location would be on lines 281 – 284 of plugins/wp-mail-smtp/src/Admin/Pages/SettingsTab.php