Good morning gentlemen, I wanted to see if they could get me out of a bind, I have a client who commissioned a newsletter with interactive sectors linked to their networks and web, it happens that I built it entirely in html, when uploading it to the server it can be visualize perfectly, but when sending it in your mailing manager the newsletter disarms everything. The manager of mailing is provided by his hosting, and from the technical service he was told that it is very normal that the forms have to adapt to several "User Agents" and that the CSS must have alternatives based on who opens them. The problem is that I do not know how to adapt the code to different User Agents. I enclose a capture of how the newsletter is when received with GMAIL.
I would appreciate if anyone can give me a hand with this, if it is necessary to upload the code, my client is already driving me crazy. Thanks from now