To: $email
Subject: $subject
Mime-Version: 1.0
Content-Type: multipart/related;boundary="nfcoremimeboundary"

--nfcoremimeboundary
Content-Type: text/html; charset=utf-8

$email_html

--nfcoremimeboundary
Content-Type: image/png;name="nf-core-deepmodeloptim_logo.png"
Content-Transfer-Encoding: base64
Content-ID: <nfcorepipelinelogo>
Content-Disposition: inline; filename="nf-core-deepmodeloptim_logo_light.png"

<% out << new File("$projectDir/assets/nf-core-deepmodeloptim_logo_light.png").
    bytes.
    encodeBase64().
    toString().
    tokenize( '\n' )*.
    toList()*.
    collate( 76 )*.
    collect { it.join() }.
    flatten().
    join( '\n' ) %>

<%
%>

--nfcoremimeboundary--