To define the Message attribute, you can use the following wizard:

In this wizard, you specify a content of particular parts of an email message: drag and drop the proper field from the Fields pane to the Value column.

You can also specify values to be used if the mapped field is empty. The alternative values of these attributes should be typed to the Alternative column. If a field is empty or has null value, Alternative is used instead of the field value.

You can add additional headers, for example Cc, Bcc or Content-type, using the plus button.

The resulting value of the Message attribute will look like this:

The Attachments attribute lets you add files as an email attachment.

The attachment can be a file with invariable path (static file), a file whose name is received from an edge or a file whose content is received from an edge. These ways can be arbitrarily combined.

The attachment is specified as a sequence of individual attachments separated by a semicolon. It is defined as a field name (file name received from an edge), as a file name including its path or as a triplet of field name, file name of the attachment and its mime type. Each of these three parts of the triplet can be also specified using a static expression.

The attachments is added to the email using the following Edit attachments wizard:

You add the items by clicking the Plus sign button and remove by clicking the Minus sign button. Input fields can be dragged to the Attachment column of the Attachments pane or the Arrow button can be used.

If you want to edit any attachment definition, click the corresponding row in the Attachment column and the following attribute will open:

In this wizard, you need to locate files, specify them using field names or the mentioned triplet. After clicking OK, the attachment is defined.

If you want to use non-ASCII characters in filenames of attachments, value of the system propertymail.mime.encodefilename needs to be set to true. Any non-ASCII characters in the filenames will be encoded then (default is false).

Default MIME charset to use for encoded words and text parts that don’t otherwise specify a charset (not only filename, but subject, message body as well) can be specified using the mail.mime.charset system property. The default value is the value of the file.encoding system property.

The EmailSender component is implemented using the JavaMail reference implementation library. JavaMail specification lists Java system properties which control behavior of the JavaMail implementation. For description of these properties, see the JavaMail API documentation. Use -D Java VM parameter to set the value of a system property.