Anyone know of a source to explain using CSS in HTML email? We send out a monthly reminder ... it works fine. Outlook screws it up and now PHP is not sending it correctly. I'm totally lost on ...

The "external sender" warnings shown to email recipients by clients like Microsoft Outlook can be hidden ... from emails is just a few lines of HTML and CSS code. This is problematic as phishing ...

Another possibility is that the format of the text in your email does not fit the standard HTML formatting that Outlook uses. CSS or GIF formats can cause Outlook to fail processing the whole or ...