I regret we do not use the Multistore function yet ourselves.
On a separate note, we find messages sent from User's Mobiles (especially iPhone) displaying complete formatting code eg:
........................@media screen and (max-width:300px){
#yiv0828342493 body {
width:218px !important;margin:auto !important;}
#yiv0828342493 .yiv0828342493table {width:195px !important;margin:auto !important;}
#yiv0828342493 .yiv0828342493logo, #yiv0828342493 .yiv0828342493titleblock, #yiv0828342493 .yiv0828342493linkbelow, #yiv0828342493 .yiv0828342493box, #yiv0828342493 .yiv0828342493footer, #yiv0828342493 .yiv0828342493space_footer{width:auto !important;display:block !important;}
#yiv0828342493 span.yiv0828342493title{font-size:20px !important;line-height:23px !important;}
#yiv0828342493 span.yiv0828342493subtitle{font-size:14px !important;line-height:18px !important;padding-top:10px !important;display:block !important;}
#yiv0828342493 td.yiv0828342493box p{font-size:12px !important;font-weight:bold !important;}
#yiv0828342493 .yiv0828342493table-recap table, #yiv0828342493 .yiv0828342493table-recap thead, #yiv0828342493 .yiv0828342493table-recap tbody, #yiv0828342493 .yiv0828342493table-recap th, #yiv0828342493 .yiv0828342493table-recap td, #yiv0828342493 .yiv0828342493table-recap tr {
display:block !important;
}
#yiv0828342493 .yiv0828342493table-recap{width:200px!important;}
#yiv0828342493 .yiv0828342493table-recap tr td, #yiv0828342493 .yiv0828342493conf_body td{text-align:center !important;}
#yiv0828342493 .yiv0828342493address{display:block !important;margin-bottom:10px !important;}
#yiv0828342493 .yiv0828342493space_address{display:none !important;}
} .................................
Several email exchanges with clients can then result in a large amount of Form real estate being used.
This is not generally an issue, just a tiny inconvenience.