Late to the party but here goes… I have experienced this problem as well and it was solved with the following:
- Including the scheme in the src url (using “//” does not work – use full scheme EG: “https://”)
- Including width and height attributes
- Including style=”display:block” attribute
- Including both alt and title attributes
EG:
<img src="https://static.mydomain.com/images/logo.png" alt="Logo" title="Logo" style="display:block" width="200" height="87" />