Hi John Coy,
I only know abit of coding and am unable to resolve the issue so far after few days checking.
Could you assist? you can add the below span tag code below the <body> tag in woocommerce\email\email-header.php, “Hello I am testing!” should appear in woocommerce email preheader, i am opening email in hotmail account in desktop but unable to see this preheader now.
<span class=”preheader” style=”color:transparent; display:none !important; height:0; opacity:0; visibility:hidden; width:0″>Hello I am testing!</span>
