Email problem with signature attachement

Hello,
I have a form with 2 check boxes and a signature.
On submit I send an email to a recipient with the signature field as an attachemnt using the code below to attach it, at the attachemnt list field:

<img src="{data:signatureconsent}" />

​
I get an error from the debugger that tells me that the mail could not be send.
​
When I use tha same form without the attachment the mail is send without error.

​
Bellow are the debugger's outputs for the 2 situations above:
​
With signature attachment (with error):

Array
(
    [validate_fields2] => Array
        (
            [log] => Automatic validation enabled.
            [var] => 1
        )

    [email9] => Array
        (
            [recipients] => Array
                (
                    [0] => christoforos@e-logism.gr
                )

            [subject] =>   Συναίνεση
            [body] => 
<table width="100%" cellpadding="5" cellspacing="3" border="0" class="ui table"><tr><td width="30%" valign="top" align="right"><strong>Συμφωνώ στη χρήση των στοιχείων μου όπως περιγράφεται στο παρών κείμενο.</strong></td><td width="70%" valign="top" align="left">1</td></tr><tr><td width="30%" valign="top" align="right"><strong> Συμφωνώ στη δημόσια χρήση της φωτογραφίας μου όπως περιγράφεται στο παρών κείμενο.</strong></td><td width="70%" valign="top" align="left">1</td></tr><tr><td width="30%" valign="top" align="right"><strong>candidate_name</strong></td><td width="70%" valign="top" align="left">SOPHIKO ODIKADZE</td></tr></table>
            [files] => Array
                (
                    [0] => <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA34AAACWCAYAAACB1lpmAAAgAElEQVR4Xu2da8h+S1mHfx7SytTUlMo8oZFRaYLQhwqT6EAhqUnmzjBNTMpQycgKUsnAELKCwg2lBklKmkoEppJZBH6xrUKRknlKCjIPIaaF7rjca2z28nne9zmstZ61Zq4FL+//sA5zX/esWfObueee28RDAhKQgAQkIAEJSEACEpCABJomcJumrdM4CUhAAhKQgAQkIAEJSEACEojCz0ogAQlIQAISkIAEJCABCUigcQIKv8YdrHkSkIAEJCABCUhAAhKQgAQUftYBCUhAAhKQgAQkIAEJSEACjRNQ+DXuYM2TgAQkIAEJSEACEpCABCSg8LMOSEACEpCABCQgAQlIQAISaJyAwq9xB2ueBCQgAQlIQAISkIAEJCABhZ91QAISkIAEJCABCUhAAhKQQOMEFH6NO1jzJCABCUhAAhKQgAQkIAEJKPysAxKQgAQkIAEJSEACEpCABBonoPBr3MGaJwEJSEACEpCABCQgAQlIQOFnHZCABCQgAQlIQAISkIAEJNA4AYVf4w7WPAlIQAISkIAEJCABCUhAAgo/64AEJCABCUhAAhKQgAQkIIHGCSj8Gnew5klAAhKQgAQkIAEJSEACElD4WQckIAEJSEACEpCABCQgAQk0TkDh17iDNU8CEpCABCQgAQlIQAISkIDCzzogAQlIQAISkIAEJCABCUigcQIKv8YdrHkSkIAEJCABCUhAAhKQgAQUftYBCUhAAhKQgAQkIAEJSEACjRNQ+DXuYM2TgAQkIAEJNEzg7kkekuTdST7WsJ2aJgEJSOBsAgq/sxF6AwlIQAISkIAELkDgq5O8J8m9knwgyQMuUAYfKQEJSGAzBBR+m3GVBZWABCQgAQlIoCLwqiSPr/7+mCSvl5AEJCABCewmoPCzZkhAAhKQgAQksDUC35PkraNCK/y25kXLKwEJLEpA4bcobh8mAQlIQAISkMCZBO4/iL6vTfLl1b2enOQVZ97byyUgAQk0S0Dh16xrNUwCEpCABCTQHAFE3+uSfHuSFyV5bmWhM37NuVuDJCCBKQko/Kak6b0kIAEJSEACEpiLAGLv5UMSl0cPWTzfVT3soUN2z7me730lIAEJbJqAwm/T7rPwEpCABCQggS4IsKbvpUk+muQZSd6ZhKyeH6+sv1uST3RBQyMlIAEJnEBA4XcCNC+RgAQkIAEJSGAxAs9P8rwkb0jCTF85mAG8qfr7wwZBuFjBfJAEJCCBLRFQ+G3JW5ZVAhKQgAQk0A8BZvRekuSnkjw7yW+PTB9n9nxkkr/uB4+WSkACEjiOgMLvOF6eLQEJSEACEpDA/AQQfezJx6wes3y7BJ3Cb34/+AQJSKAhAgq/hpypKRKQgAQkIIEGCCD2yNz5yUH0fWCPTYZ6NuBsTZCABJYjoPBbjrVPkoAEJCABCUjgagLM4iH6WM/3rGuStZjcxdokAQlI4AgCCr8jYHmqBCQgAQlIQAKzEUDokciFn/F6vn0P/VyS2yb5fJLbzVYybywBCUigAQIKvwacqAkSkIAEJCCBDRNg5o79+cjKSSKXYxK03FzZbZ9mw5XAoktAAvMTsJGcn7FPkIAEJCABCUhgN4Gynu+Dg+jbt55vHz+FnzVLAhKQwIEEFH4HgvI0CUhAAhKQgAQmJVD253vBEN557M3Ha/zs0xxL0PMlIIGuCNhIduVujZWABCQgAQlcnMD9h9DOuw0JXI4J7awLr/C7uCstgAQksCUCCr8tecuySmBdBO6e5CFJ3p3kY+sqmqWRgARWSoAELqzjY48+Erh84oxyKvzOgOelEpBAfwQUfv35XIslMAUBRuzfkuSBSd6R5OFT3NR7SEACzRJgLR+hnRz8fucEltIOvb+6j32aCaB6CwlIoF0CNpLt+lbLJDAXATpwf5bkAdUDvj/Jm+d6oPeVgAQ2TQChx+zcKyYSfAXGeAN3+zSbriYWXgISmJuAjeTchL3/FgncM8m3GMK403VsrkzadUba6+M3kzx3i862zNcSMKT3WkSesIcAwoywTsI5y2zflLBoj9463PBdSXiehwQkIAEJ7CGg8LNqSODWBJ6W5Mbhn/40yY8J6IsEHp3kdXt4PPuIDZdFui0CH07yDUlIs1/P8m7LCku7JIEi+Hjm1LN8tR218LN+LulhnyUBCWySgMJvk26z0DMR+L4kb6ruzb5S45mtmR69+tuSkOEle0r5mSTfPAiD1RtiAY8i8OIkz6mueMyQlOOom3hyVwSeN2zEjuAjgcucRy383paEv3tIQAISkMAeAgo/q4YEbiHACDUhQ6xDKQczHfcV0BdCtOjMcXwyyV8kuaHi8iejv4usDQK8C/+Z5LaVOQq/Nnw7hxWPGITeG4awzmM3Yj+lTPUaP4XfKQS9RgIS6IqAwq8rd2vsFQRIK/7MHf/f+ztSiz5mQAn3hBWdvHIY5tnmq/W7SX7egZA2nTuhVQwQEA3wyGFPvrln+eqi11k9FX4TOtVbSUACbRLovVPbple16hQCpBZ/6I4L2WD4nH2mTinLWq4Zz/Qxus4oPjzuWhWSDt+pGzCvxVbL8aUExn42gY+1ZEzgR4ZZvhfMlLzlOuIKv+sI+f8SkIAEKgIKP6uDBG5Zx1fvBQWT9w171PUqalif86ShcpAtj5m+Erp186jSPGziFO3WycsTqNdOldL0+i5c3hvrKwFtJomeSPZTNmO/VClLe0SIKe2UhwQkIAEJ7CGg8LNqSOCWzkKdrZJ1bAgfQj+fPPy5J05Xib5dItl2pL3awQxuHc6LhQq/9vx8ikW0i4R7/9EQ2nnpiIgyM63wO8WbXiMBCXRFwA5bV+7W2D0Exuv76EDQ8WXdSk/r11irQ6KWHxw4sWYGUVx37MYzQYjkOiGOlWz7BMpAyGeT3LEyR+G3fd+eYwGh3gyQ0W9glm8t4d0lTN81fud412slIIEuCCj8unCzRl5DYDy7wXoVwhrZqPxSa1eWdhozedhb0qHvGz0fCz83TV7aU/M+DxF/07CNyV8m+QGF37zAN3B36gSzfAyCEQ3AQNkSGTsPRVOE398l+a5DL/I8CUhAAj0SUPj16HVtHhMYJ3ZhZgOBwxYGPYR6MpKP6OM3x2uTPG5PNRkLP0fZ23qfSpgvgv6NSX5J4deWg4+0hvedtoEkV5dey7ev6KXOGup5pHM9XQIS6I+Awq8/n2vxlxIYZy/kvSididbD20r4Vtmo/neGdTv76slY+PUyI9rDe/OsIbyZ8F3qQ9nbstje+rvQg48PtZFZPga+qBMIKkTfpdfy7Ss720eQXdRBqEO963kSkEC3BBR+3bpewysCdZbKMmpMJ4d/Z6S71WO8af0hIq7eMBkuPa2BbLUeYFdZ14fo48+EPxM297eV0Wx38u6WIWjbFwiUwaA1z/LVriqDdISfkmXUQwISkIAE9hBQ+Fk1eifAyPbHKwg/l+Qfk7w1yXWzX1tmN565I0Mfo/rXHeOsno8Z9vG67jr/f70EEHo3JrlXktqfY5FPp3pNa7vWS3S7JSOsk3Zg7bN8NeGSnEvht916Z8klIIGFCCj8FgLtY1ZLYLyVA6PcL0xyQ5LHrihz3ZQAxzYfI3DHQtnwvyk9s/y96lnf8XrW8eCA+zUu75+lnliv5Xv+kMBlqWef+xzKS1gqURotR2icy8nrJSABCXwhLbOHBHomUG/lQEILOkDMALa6TQGj+Yzql+PQmb66jnwuyW2TfD7J7XquPBu3vRZ2u5IYKfw27uADil+v5WONHO3D1mZ1FX4HONpTJCABCUBA4Wc96J1AndETEcTf2b/vkPVuW2NXkneUcp9qY1kT+cEhCcjWOFjeWwY42JONjv++ejAWfoZ6tlVzmPlnEIg6sOXsxUX42adpq35qjQQkMAMBhd8MUL3lZgiMwxbp/NCJuN8QMrTWLHanAB5vUn+q6KuZtToregrfLV1Ti76rwnzHws/vxZa8vL+s9Z6dzPIhALfc1in82qiXWiEBCSxAwA/5ApB9xGoJjNe6PSrJnydpaSYLocaoPrZyINbO2Y+rTu7SEqfVVtKJC4bvmdG+aqavPHL8fvi9mNgZC9+ubMSOUKIdIAKAjJhbPxR+W/eg5ZeABBYj4Id8MdQ+aIUE6g4D6/tY28J+UFsOe6oxI9JeleQ7hn9EqNHxJ1X/qUc9C+S+WadSvMx19frOQ2Z8nfG7jJ/meCoiHsFPm3DKut45yjTVPesQdvs0U1H1PhKQQJMEbCSbdKtGHUgAAfSI4VxmxRB8HC2sZRpvzD5V4gaF34GVa0WnMdNDp79s13HoFhyEPNeJPsiYuOWQwBW5ZLGi8L7ie9oD2gBEEuuYWzrqmekW2u6WfKMtEpDAyggo/FbmEIuzKIFPJbnT8MRXJ3n80Dmis7Tlo17DhR2vTfLUiTrtCr9t1QxEH0lc8Fu9OfshVozXwNqpPoTaOs5B6LHFAaKImX4E3+vXUbTJS1G3SW4vMzlebygBCbREQOHXkje15VgC/5Pky4aLPpLk3g2EeZ6zR98h/BR+h1Baxzn1AMCpM74lgysW2aleh1+vKkUt+Fpax3eVzfUAxbM3tgfh+muUJZSABJoioPBryp0acwSBOknJfyf5imFGhH/fajgbo/qM8tMR4pijE6TwO6KSXfDUev3qIev59hW1Fn6trH29oFtme/R4ho+kLdSBXg5CkglNvipLbS8serGTb/Uzkzw8yd8k+dVeDNdOCZxDQOF3Dj2v3TKBemaMmb87bLjTMF7DNedIPx3MmwbHvzfJN225EjRY9jqL6xQhfvU+l+9L8qAGmW3ZJAZi6PyWkE62bUH0bXXw6lRfEMZKYi7q68NOvYnXbYIAdZ06P16S8S9JHrgJCyykBC5IQOF3Qfg++qIE6hmRUpAtrmEiYQezfIx+chy7jusUJ3wuyW2TsEbyzqfcwGtmIUAdYD3flIk8XprkZ6rS0qluLTnILM6Y+aaIHNowfE1G4iL4Zn7sam9fZ/Y0CdFq3XRywWjbnpTkidcMPt2Y5OknP8ULJdABAYVfB07WxJ0E6o4CJ2wtxTmjngg+On7lWGoz5hJWxXNtQ9bxgo03ZUcUTDHr891DGFWxcmvvyTq8M00p6Pwi+Gi7+PMbhtm9VpO2HEOtjkQ4NGvtMff33OUJEL2A2GNws/7OURKiGaj3TxkNPr5jCP1cvrQ+UQIbIWCnbSOOspiTE2D9229Vd33CsOfd5A+a8Ial4/eM0ajnFCF9xxSzDv8z4ccx5OY5l9keQp/+LckNZ+7TuKuEtdDn/51RmceP++5Kp5cOMIM9sKfDi8+deb01sQ8luc+Qxfhxy7rIp01IoA5frm9LNAt1/43Vt5qwZt6Ncri37ISO8FZtElD4telXrbqewHgmY62JK+j0sdcgH0M6fvVxqRCvev9DR9evr2tzncFAAHu0lfVd1JF6372pnjueHcf/CH6P+Qgw2/HQKpyzzHDQ0Z3Dx/NZstydiwiAD2H7HtsisCuKpdR72pxdM9tl0Evhty1fW9oLElD4XRC+j74ogZIMoBTi0kkB6Ogh8BB6/NCpH4e31B831l696kIE6/WRZtG7jBOoGy+v1vPRaZoitHOXNdRNOtN3rf7zlcN6m8tY3+5T8SvhnPiTPxNa6+zeYf6uMw5vcb32YVa2dxbfOtqyOlnLofV+vFYfoVjWu7dHSoskMAEBhd8EEL3F5giwZoAPzfj4qyTfu5A1JWyTj10Relc9uoS5rKETWGdEdXR9oQpTPYY6Q/2lDi215m7XO0NdJGTa4zwCCOtvTfLrVbIWBqLg6+ze4Wzdz+9wVms4k/brF5KwdIGjzO4dU+/Hwo8omH0Dpmuw2TJI4OIEFH4Xd4EFWJhAnQSAjwThVPXBTCDhi3McCCZG8+m4sxbldlc8BKFH548Ql/IzR5lOuWfdweJ6Mz2eQvG0a2rRPcc+jVeV6sVJnjM64Zw9Ak8j0M5VzPCXxBX3TPLPQ2gn7/1cs7ft0Nttids6bMPD1HvC1MueswxgIeKOHegYCz8HIrfhf0t5QQIKvwvC99GLE2CE8a3DTAnCir8TMvn4UUnoeNGpRnCdexSxx+/ykRvfk5FOnsVzy8/aO351qOxSs07n+mLr15dOzhJbduxjNV5Tw3mu+Tu8ZjHoU0I5aX8YfOJd4sdkLYdz3HdmvR7VcM/zeU59hzpEnXuTmRYReOr3rh4I434Kv6k95v2aI6Dwa86lGnQFgZKNko4zHbDS0Rqv9yu3+PdhHR0dW7KFHfJxKmv1SjKWfesN3pzkTUlec8Io5xqcXIf+fTrJndZQqIbLUBJXXFL0FbzjTHr8O+8Ss39uLXDrSsj7X5Iz0SaU9oD2BCHv7N60Ly183z/c0tnoadmee7fxLN8UCdVqf1M+vtFkvvWQgAT2EFD4tVU1aAQZ8fzwkNL62LCJtmjc2ppa3O3KRLlP/NV32RVyScgmSS9uf8BaPWb2mDHhWS345r+qPZTM7jnP28NAAuv5SuZOfl96ZogyUY/rNOrFesIVXzisPZyHyLrvyowG4eP8Lut3S4kRe2V2r4X3f62eKG25ImAdHqrbMEo09X6z4+1m7Neuw++WYqUEfEFW6pgTioXgYwS5zrxX1oiRebHnjkY9Q7FPoPBxYkQSjvc7gf9Vl7S60XLN1XDPiSvNIB5eN8wSERKI6FvTe7wvSVIZeS8i59DZ8ukJTndH2gfE3M3DLRlkK7N3V2XhVexN54ND73TJdbCHlrGX83g3ShtGtAJ9FAaNpjxeloTZw3IY4jslXe/VHAGFXzsuvemabFZ0wmgcDwlXbIfKLR8ZNrfmODQZBh2Hn03ydUO2vWN58IEr+w7BvVXmdQfL0fVja8nV5zMA8bxhXSgDB+M9HKd92ul3QxDRmaNtucsVt0GwFtHKgBTJTIhM+Kfh/SjvCN+k+tzTS/alV1JWfhjYQbSVv9d/Lv9Wfh/7fITeGhMyHWvH1s8ve41Sr0g+taYBk62zPbT89feBaBcGiqZYNz9+/kOGtbLl36cIIT3URs+TwOYIKPw257K9Bf5okntcY87fD9sVtCpExubXI4GnrvegU0jIVgnbqrOA8jH7VJJ/TfL2KjFLT50M6lKZZfaDe357wgg52e7KnlZbYvq0JD80JC85n8T/32EsBMv7VX6XpEm1aOPq8u/3TXL3MwvEYA7PK21nXSY6s3OJ1TOL3e3ldfZmkw8tXw3qAdclohXqcM81D5Qt7wmfKIERAYVfO1UC8XHvA8yh40JnsuUkDHT46DwzwsjhJuMHVIwTT6nDPe1gnQhxmIFiZpo6S/1l5og/b3EQgcESRvv5IbHJWg4Gamj/+ClCrfy9/KasReD1MkC2Fv9MXY66bTo02mPqMvR2v/Fm7CwBIHph7nepFppGn/RW67T3KAIKv6Nwrf7k30vyv0k+k+TBw6xBveavNuCRM4VdXBrS+MNDYoynXLpQDT+fmSm2yCgHYX/MrnocRgCRR8eIRCnUXWaW+Dud1laOMntZQirpmDEL95VJyJwLg3rNXFk7d8xaW7gVQcfvki2T387GtVKTjrejngly7dfx/I65ot5KY671fPvKM97Wwb1lj/Gc53ZFQOHXvrt/Islv7EhYQueID+HcI3FLEqaDidArHcdTwzuXLHMLzyrraYotTxi2wWjBtjltoKPELJ/19XrKhO6N98GsZ++uv4Nn9EiAekP7xAAoGWe/sUcIM9s8Dk8ntJNohaWzD5fES5jrt39mp3v77RJQ+G3Xd8eWfNd2Ba2E5iH46EDXCTAM7Tm2hpx+PsKFulRmaNjmgU2q51jIf3op13ElrGCD6OPPhB/ybjJT2tIgzDpoWwoJ3PJdILMkh9mHp6sR420alp7lG1tS93HWsJE7/RLaegQw9c5DAqsgoPBbhRsWK8Qu8feHSZ66WAmmexCjjKwfYmSRP5djzuxh05W+vTvhAxLc3HEwDRHD1hmKv1uAwKcMTtBhIqPlrw18triOr70arEUtE3C933TepS37xSQ3DLdE8MH30oNX4+1lLhnuyaAemdZLlIJhxtPVP+90JgGF35kAN3Y5jRDib5xwgUa73gdnrWaVZBH8LuFxpaxr+fisld0S5Rqv9+OZ1C1mX3udzaIzwvq9ss6NgQkSEUy9l9US/vUZEtgyAWZeSlbmVte4z+kfvru0ZXVkDRk0EXxLh3XuspP+DYNoJa8BfR0GHy9x1AMNPF/hdwkv+MydBBR+fVaM1yT50ZHpNNyIvzU04HXRGF3kY1OyHY49xnoCGll+ehUXa6rFu8QffkHokF21Bx+NZ/fwD/UUBi0lbVlTvbMsEriOAMLg48NJtEOEWxuCdx21W769RCvUkTVLZeu8vnS3PgMRyv6n5bjErB+cSHhWZvvcXuJYL3r+rAQUfrPiXfXN6wxcdUEZIVvDVg+MKtKA1x+bUk4aUspY9s9aNegOC4f4Q+DsysqI3xCArYWAlgGK8Wx0qasKvg5fBE1eHQHeT97FelaoxfboXPC7Bq+455pm+HbZiNhi8Lp8e5ae9RsnmKOMd+tkwPPcOuf1CxFQ+C0EeqWP2Sf+fjnJiy5QZsI3md17YpIHjZ5fOtA05D3MGl0A/6SPLNsU1KOv9QP4ODM6i1+3dmAbIWN85Okg1aFP2FLCjulgrm0GfWusLa8Epiawa2CKfXD/OMmNG90781xGtGksAaEtg0+9lKK0Z0QsbGE98nit348nefW5gK65Hl58634yye2qc4mictBvZvje/jgCCr/jeLV4Nh1XxNR4dmbJ/dj40JRwzpox66FoNPngKPa2WfvoUPAhZpCBvdvGbc7aBSDvByKPDzt/pq6OtxXAM9RVZjF5l9YwY77N2mKpJbAMAd5nvnF8d8YH7y/fnS0OSh1Dj7asiL1dkTUlPH2Lg611IjtE/bfN0IegDsEPjnzj6uPSGU6PqQee2xkBhV9nDr/C3F3r/ubeC4fRRdYOlMQXpXgmwGizXuJnBCAprscHI8l0xC655qaIPH4XkbfPE0XoIVwRfM7stVlntaptAnTeaZN+OslXjUylTUIA0iZtYabrOk9ha0mQtm8A623V4NWWbWZwjn0b7zFAoY1m9u0cm/gm/HCShw/fh3GCucL/PUme3uByhuvql/+/EQIKv404aqFi7gr9ZLaNrIxTHoyOERaxKzMnnX8zHk5Je3334gNKXds12s7MbulszSWmeD4z3EXgPXAYEd5His4QZeGHjkNr6xPXV0MskQSWJcC3iO8SP7vWJtMmMYu0tVlA7CFi4VFJaOfGB20b7VkZvGopsmZXorH3J/lIkreM2nGEIt+D+wzrP29fRXbw77uiPMYszSy+7Dvr004koPA7EVzDl42zYmHqy4YR0XPMLuv36PDvakSZXTSk8xzC27v2qnCrYk3pkLw3yYeGjzbiq6Tu3md1+ZCTxKGEafJ7PLtcX09oUxF45XdLHaHt1RBLLIHlCRQBON72iJLQHpRwbkTT2toHRAoRFbRzu9o6IhUoP+1bD2vP9uUxmLJWmX9gSprea3YCCr/ZEW/yAQgwQjDr45SZv/IRIrxk1xoC7k+jSeN8TgjGJiFb6C8SKKPt1IOSbe9YPNSffaE3++5Vwpq41nV5xxL3fAm0TaCEgSIE97VL9WwZA0dLfscoH7N5JSx936AW39iy/njJ8q2ldsCFAe1dQv7YMv5HEgYh/8Cs4sei8/y1EFD4rcUT6yvHK5PcMCrWZ5K8vQp5Y9SQ8AZGPfkI3ZzksUNIyXdeEx6x9rTQ6/NIHyUqWeVKGOapQnBMq3TK6o5aH0S1UgISOJcA7VL5uapN4ltYr/s9VwyWtXglcqGIu6siF+pEU7R3a5uVPNcXp15PH4WM4WWNXh3SSz8GUfzZYa9H+jnlKD7l/3sUzqfy9rqVElD4rdQxKynWrpm/c4pWwky2khb6HFu9dhoChGzyc5ckdx8GGMq/ld/lSSWEmI8zH+vyoaYjZudnGn94Fwn0TqCEUZaZtkMGp+o1wvCrRQSCpEQrcE/+TFv29UnucABsvqtFbJpo6gBg1Slw9ttwHDPP3jgBhd/GHbhA8c8Vf2VLhrKuYIEi+wgJSEACEpDAIgSKcCu/i3i7d5KvmagEfEc56rXHJdmUs1ATQfY2EuiBgMKvBy+fbyMhLr+S5MFJ7nzN7T6d5B+S/L4x8OeD9w4SkIAEJLBZAiWxFDNLdXIpxCEzhYQYcpQohRKdUDIaMxtlFuHNut+CS2B9BBR+6/PJ2ktUZ0gsH7MSVmeYydq9Z/kkIAEJSEACEpCABLokoPDr0u0aLQEJSEACEpCABCQgAQn0REDh15O3tVUCEpCABCQgAQlIQAIS6JKAwq9Lt2u0BCQgAQlIQAISkIAEJNATAYVfT97WVglIQAISkIAEJCABCUigSwIKvy7drtESkIAEJCABCUhAAhKQQE8EFH49eVtbJSABCUhAAhKQgAQkIIEuCSj8unS7RktAAhKQgAQkIAEJSEACPRFQ+PXkbW2VgAQkIAEJSEACEpCABLokoPDr0u0aLQEJSEACEpCABCQgAQn0REDh15O3tVUCEpCABCQgAQlIQAIS6JKAwq9Lt2u0BCQgAQlIQAISkIAEJNATAYVfT97WVglIQAISkIAEJCABCUigSwIKvy7drtESkIAEJCABCUhAAhKQQE8EFH49eVtbJSABCUhAAhKQgAQkIIEuCSj8unS7RktAAhKQgAQkIAEJSEACPRFQ+PXkbW2VgAQkIAEJSEACEpCABLokoPDr0u0aLQEJSEACEpCABCQgAQn0REDh15O3tVUCEpCABCQgAQlIQAIS6JKAwq9Lt2u0BCQgAQlIQAISkIAEJNATAYVfT97WVglIQAISkIAEJCABCUigSwIKvy7drtESkIAEJCABCUhAAhKQQE8EFH49eVtbJSABCUhAAhKQgAQkIIEuCSj8unS7RktAAhKQgAQkIAEJSEACPRFQ+PXkbWSsQwAAAAJtSURBVG2VgAQkIAEJSEACEpCABLokoPDr0u0aLQEJSEACEpCABCQgAQn0REDh15O3tVUCEpCABCQgAQlIQAIS6JKAwq9Lt2u0BCQgAQlIQAISkIAEJNATAYVfT97WVglIQAISkIAEJCABCUigSwIKvy7drtESkIAEJCABCUhAAhKQQE8EFH49eVtbJSABCUhAAhKQgAQkIIEuCSj8unS7RktAAhKQgAQkIAEJSEACPRFQ+PXkbW2VgAQkIAEJSEACEpCABLokoPDr0u0aLQEJSEACEpCABCQgAQn0REDh15O3tVUCEpCABCQgAQlIQAIS6JKAwq9Lt2u0BCQgAQlIQAISkIAEJNATAYVfT97WVglIQAISkIAEJCABCUigSwIKvy7drtESkIAEJCABCUhAAhKQQE8EFH49eVtbJSABCUhAAhKQgAQkIIEuCSj8unS7RktAAhKQgAQkIAEJSEACPRFQ+PXkbW2VgAQkIAEJSEACEpCABLokoPDr0u0aLQEJSEACEpCABCQgAQn0REDh15O3tVUCEpCABCQgAQlIQAIS6JKAwq9Lt2u0BCQgAQlIQAISkIAEJNATAYVfT97WVglIQAISkIAEJCABCUigSwIKvy7drtESkIAEJCABCUhAAhKQQE8EFH49eVtbJSABCUhAAhKQgAQkIIEuCSj8unS7RktAAhKQgAQkIAEJSEACPRFQ+PXkbW2VgAQkIAEJSEACEpCABLokoPDr0u0aLQEJSEACEpCABCQgAQn0REDh15O3tVUCEpCABCQgAQlIQAIS6JKAwq9Lt2u0BCQgAQlIQAISkIAEJNATgf8DyWLS03dlTUAAAAAASUVORK5CYII=" />
                )

            [result] => the Mail could not be sent.
            [var] => 
        )

)

​
Without signature attachment ( no error):
​

Array
(
    [validate_fields2] => Array
        (
            [log] => Automatic validation enabled.
            [var] => 1
        )

    [email9] => Array
        (
            [recipients] => Array
                (
                    [0] => christoforos@e-logism.gr
                )

            [subject] =>   Συναίνεση
            [body] => 
<table width="100%" cellpadding="5" cellspacing="3" border="0" class="ui table"><tr><td width="30%" valign="top" align="right"><strong>Συμφωνώ στη χρήση των στοιχείων μου όπως περιγράφεται στο παρών κείμενο.</strong></td><td width="70%" valign="top" align="left">1</td></tr><tr><td width="30%" valign="top" align="right"><strong> Συμφωνώ στη δημόσια χρήση της φωτογραφίας μου όπως περιγράφεται στο παρών κείμενο.</strong></td><td width="70%" valign="top" align="left">1</td></tr><tr><td width="30%" valign="top" align="right"><strong>candidate_name</strong></td><td width="70%" valign="top" align="left">SOPHIKO ODIKADZE</td></tr></table>
            [result] => the Mail sent successfully.
            [var] => 1
        )

)

Hi Christoforos,
​
The signature is not an image - just a long base_64 encoded string. Please see this FAQ if you want to convert it to an image.
​
Bob

What Bob said, and also several mail providers (GMail for example) don't support base64 encoded urls so either way you'll have to convert it to an image first.