For sending mail you can use Asynchronous Mail Plugin.

1. Install Asynchronous Mail Plugin :

Dependency:  compile “:asynchronous-mail:1.2″

2. Usage :

Add following:

import grails.plugin.asyncmail.AsynchronousMailService

     AsynchronousMailService asynchronousMailService

3. In your method to add multiple attachment create map as shown below,

Map<String,ByteArrayOutputStream> attachments = new HashMap<String,ByteArrayOutputStream>();

ByteArrayOutputStream bytes0,bytes1,bytes2; // attachments

attachments.put(‘key0′,bytes0);

attachments.put(‘key1′,bytes1);

attachments.put(‘key2′,bytes2);

asynchronousMailService.sendMail {
multipart true
to emailID
subject emailSubject
html emailBodyContent
attachBytes “Approval”, “application/pdf”, attachments

}

attachBytes is used to attach attachments.

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