I sent an html email invitation using php's mail function and some of the people that received it aren't able to forward it to others. When they forward it the person that receives it receives only text. I'm thinking it may be a problem with the end user sending it as text but was wondering if maybe there's something in a php header i could set to force it to send as html no matter who is sending it.
I'm not aware of such a solution but what you can do is send your original email as a Mulipart/Mime email with the first part plain text and the second html. Those whose email clients support html will display the HTML, those who don't will see the plain text. ๐
Hope this might help๐
mail(<RecipientMail>, <Subject>, <MsgText>, "MIME-Version: 1.0\n"."Content-type: text/html; charset=iso-8859-1");