Logo on emails is stretched vertically

Despite my uploaded logo looking fine on the website, at the top of emails it is stretched out vertically and looks very strange. The culprit is (I think) an unnecessary "height:75px;" parameter in the CSS of the email. There's already a "max-height:75px;" so the former is unnecessary and forces the logo to stretch. I really need this to be fixed, because it looks unprofessional and broken otherwise.