I'm starting up an online business and through php mail() I'll let the customer receive confirmation emails of their order, as well as a payment link. I'd like to be able to put in some eye candy to make it look more professional - an image and perhaps a colored header background - perhaps even display the order as a <table>
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Are HTML mails acceptable? Will they reach all of my customers? What are the best practices to assure arrival of the mails?
The Email Standards Project tracks which HTML is supported by which email clients, so technically speaking that's a start. They also have some good information on HTML email in general. The major takeaway may be: be careful with Gmail.
I can't speak to whether HTML emails will please all of your clients. Personally, I request plain text versions if they're available.
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