We ran into the same issue with our logo and images initially. Make certain that the location from which you are pulling the logo is accessed via a secure address.
More and more browsers are, by default, enforcing fully secure content on all encrypted pages. It's now considered a "best practice."
This is easily accomplished by placing a directory within the SmarterMail directory in the Program Files(x86)/SmarterMail/MRS/ directory
- Bruce
Bruce Barnes
ChicagoNetTech Inc
brucecnt@comcast.net
Phonr: (773) 491-9019
Phone: (224) 444-0169
E-Mail and DNS Security Specialist
Network Security Specialist
Customer Service Portal: https://portal.chicagonettech.com
Website: https://www.ChicagoNetTech.com
Security Blog: http://networkbastion.blogspot.com/
Web and E-Mail Hosting, E-Mail Security and Consulting