Emmet configuration files for email developer, snippets.json is my personal snippets which have much more advanced snippets. You should create your own snippets.json for your own snippets.

preferences.json

{
    "css.color.short": false,
    "css.intUnit": "px"
}

snippets-basic.json

{
    "html": {
        "snippets": {
            "gmacspacer": "<img src=\"http://image.service.ngic.com/lib/fef91274766207/m/1/spacer.gif\" width=\"${1:1}\" height=\"${2:1}\" border=\"0\" style=\"display:block;\" />",
            "ecspacer": "<img src=\"http://image.e.easycomforts.com/lib/fe971570726d037d75/m/1/ec_id_121228_spacer.gif\" width=\"${1:1}\" height=\"${2:1}\" border=\"0\" style=\"display:block;\" />",
            "expspacer": "<img src=\"http://image.e.exposuresonline.com/lib/fe861570726d02747c/m/2/EXP_WM_130729_spacer.gif\" width=\"${1:1}\" height=\"${2:1}\" border=\"0\" style=\"display:block;\" />",
            "afspacer": "<img src=\"http://image.em.arthritis.org/lib/fea115707260057d74/m/1/af_09_120919_spacer.gif\"  width=\"${1:1}\" height=\"${2:1}\" style=\"display:block;\" border=\"0\" />",
            "etre": "RaiseError(\"Version not recognized\", true)",
            "styleinall": "<style>\n* {\n\ttext-rendering:optimizelegibility;\n\t-webkit-font-smoothing:antialiased;\n\t-webkit-text-size-adjust:none;\n\t-moz-text-size-adjust: none;\n\t-ms-text-size-adjust: none;\n\ttext-size-adjust: none;\n}\n.notinuse1 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse2 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse3 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse4 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse5 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse6 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse7 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse8 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse9 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.notinuse0 {\n\twidth: 300px !important;\n\theight: 300px !important;\n\tdisplay: block !important;\n\tfloat: none !important;\n}\n.ReadMsgBody {\n\twidth: 100%;\n}\n.ExternalClass {\n\twidth: 100%;\n}\n.ExternalClass, .ExternalClass p, .ExternalClass span, .ExternalClass font, .ExternalClass td, .ExternalClass div {\n\tline-height: 100%;\n}\ntable td {\n\tborder-collapse: collapse;\n}\na {\n\tcolor:inherit;\n\ttext-decoration:none;\n}\n</style>\n",
            "bodyinit": "bgcolor=\"#ffffff\" style=\"margin:0; padding:0; width:100% !important;\"",
            "ebinit": "%%[\nvar @subjectline, @storenum, @storename, @country\n\nset @country = COUNTRY\n\nif empty(COUNTRY) then\nset @country = \"USA\"\nelseif COUNTRY == \"USA\" then\nset @country = \"USA\"\nendif\n\nset @storenum = STORE_NUMBER_UPDATE\nset @storename = Lookup(\"EB_StoreLocator\",\"STORE_NAME\",\"STORE_NUMBER_UPDATE\",@storenum)\nif Empty(@storename) then\nset @storename = \"find one now with our store locator.\"\nelseif @storename == \" \" then\nset @storename = \"find one now with our store locator.\"\nendif\n\nset @subjectline = \"replace\"\nif recip_type==\"proof\" then\nset @subjectline = concat(\"[${1:ID(replace)}-\",emailtype,\"-\",@country, \"-\" ,@storename,\"-\",recip_type,\"] \", @subjectline)\nendif\n]%%",
            "sline": "%%[\nvar @subjectline\nset @subjectline =\"replace\"\nif recip_type==\"proof\" then\nset @subjectline = concat(\"[${1:ID(replace)}-\",emailtype,\"-\",recip_type,\"] \", @subjectline)\nendif\n]%%",
            "v": "%%=v(@${class})=%%",
            "de": "%%${class}%%",
            "amp": "%%[\n|\n]%%",
            "upc": "%%=uppercase('${1}')=%%",
            "lwc": "%%=lowercase('${1}')=%%",
            "lhfix": "style=\"font-size:0; line-height:1;\"",
            "fontinit": "style=\"font-family:Arial, Helvetica, sans-serif; font-size:12px; color: #000000;\"",
            "rball": "<sup style=\"font-size:9px; line-height:0;\">&reg;</sup>",
            "fname": "if Empty(firstname) then\nset @firstname = \"${1:Friend}\"\nelse\nset @firstname = ProperCase(firstname)\nendif\n",
            "longver": "%%[if emailversion == \"V1\" then]%%\n\nVersion 1 OnlyForLongVer*${class}${1}\n\n%%[else RaiseError(\"Version not recognized\", true) endif]%%",
            "OnlyForLongVer": "\n%%[elseif emailversion == \"V$@2\" then]%%\nVersion $",
            "2ver": "%%[if emailversion == \"V1\" then]%%\nVersion 1\n%%[elseif emailversion == \"V2\" then]%%\nVersion 2\n%%[else RaiseError(\"Version not recognized\", true) endif]%%",
            "onlyforETTracking": "<custom name=\"opencounter\" type=\"tracking\">",
            "noalt": "<img src=\"images/replace\" height=\"50\" width=\"50\" border=\"0\" style=\"display: block;\" />",
            "ebship": "%%[if @country == \"USA\" then]%%",
            "endif": "%%[endif]%%",
            "ppc": "%%=propercase(@${class})=%%",
            "webview": "%%view_email_url%%",
            "doctype": "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n<html xmlns=\"http://www.w3.org/1999/xhtml\">\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1, maximum-scale=1\" />\n<title>${1:ADD CLIENT NAME}</title>\n</head>\n\n<body bgcolor=\"#ffffff\" style=\"margin:0; padding:0; width:100% !important;\">\n\n</body>\n</html>\n"

        },
        "abbreviations": {
            "tableonly": "table[cellpadding=0 cellspacing=0 border=0]",
            "edtd": "td[align=left valign=top]*",
            "edtr": "tr>edtd*",
            "edtable": "tableonly>edtr*",
            "alias:u": "a[href=replace target=_blank alias=replace style='color: #999999; text-decoration: underline;']",
            "alias:n": "a[href=replace target=_blank alias=replace style='color: #999999; text-decoration: none;']",
            "aliasc:u": "a[href=replace target=_blank alias=replace style='color: #999999; text-decoration: underline;' conversion=true]",
            "aliasc:n": "a[href=replace target=_blank alias=replace style='color: #999999; text-decoration: none;' conversion=true]",
            "alt": "img[src=images/replace alt=replace height=50 width=50 border=0 style='display: block;']",
            "ettracking": "div[style='display: none;']>onlyforETTracking",
            "list": "table[cellpadding=0 cellspacing=0 border=0]>tr*>(td[align=left valign=top style='font-size: 13px; font-family: Arial, Verdana, sans-serif; color: #000000; padding-left: 10px;']{&bull; })+(td[align=left valign=top style='font-size: 13px; font-family: Arial, Verdana, sans-serif; color: #000000;']{replace})"
        }
    },
    "css":{
        "snippets": {
            "lhmso": "mso-line-height-rule:exactly; line-height: 18px;"
        }
    }
}

snippets.json

{
    "html": {
        "snippets": {
            "ntbl": "tableonly>(tr>td[align=left valign=top]*${class})*${id}",
            "2row": "tableonly>(tr>edtd>tableonly>tr>edtd*${class})(tr>edtd>tableonly>tr>edtd*${id})",
            "2cell": "tableonly>tr>(edtd>tableonly>(tr>edtd)*${class}+(edtd>tableonly>(tr>edtd)*${id})",
            "lhfix": "style=\"line-height: 0px;\""
        },
        "abbreviations": {
           "tbl": "edtable" ,
           "wtr": "edtr",
           "wtd": "edtd",
           "alias": "alias:u",
           "aliasc": "aliasc:u",
           "wvtbl": "tableonly>tr*>td[align=left valign=top]",
           "htbl": "tableonly>tr>td[align=left valign=top]+td[align=left valign=top]>wvtbl*",
           "ltbl": "tableonly>tr>(td[align=left valign=top]>wvtbl*)+td[align=left valign=top]",
           "ktbl": "tableonly>(tr>td[align=left valign=top])+(td[align=left valign=top]>tbl*)",
           "jtbl": "tableonly>(td[align=left valign=top]>tbl*)+(tr>td[align=left valign=top])"
        }
    }
}

syntaxProfiles.json

{
    "html": {
        "tag_case": "lower",
        "attr_quotes": "double",
        "attr_case": "lower",
        "indent": true,
        "inline_break": 2,
        "tag_nl": "decide",
        "tag_nl_leaf": false,
        "self_closing_tag": "xhtml",
        "filters": "html"
    }
}