web2py multiple attachments recipe
    Copyright (C) 2013  Alan Etkin

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

Model (db.py)

...

imap = DAL("imap://<email address>:<password>@<imap server>:993")
imap.define_tables({"draft": "<service drafts folder>", "inbox": "INBOX"})

Controller code (default.py):

def index():
    import os
    folder = os.path.join(request.folder, "uploads")
    message = "Hello"
    # subject is just an example, replace it with
    # to, sender (naming for imap connections)
    form = SQLFORM.factory(Field("subject"),
                           Field("draft", "boolean", default=False),
                           *[Field("attachment_%s" % x,
                                   "upload", uploadfolder=folder) for x in
                             range(10)], _id="uploadForm")
    attachments = []
    if form.process().accepted:
        message = "ok"
        for k, v in form.vars.iteritems():
            # was this attachment field specified?
            if k.startswith("attachment_") and v:
                filepath = os.path.join(folder, v)
                filename = request.vars[k].filename
                # now let's retrieve the files
                if form.vars.draft:
                    # Note: if your attachment is a file with binary
                    # data, then you need to encode the file
                    # output with the base64.b64encode function
                    # and set the proper file mime type and
                    # payload encoding ("base64"). Using base64
                    # requires a pending patch
                    # (web2py google code issue 1714 by IVINH)
                    request.vars[k].file.seek(0)
                    payload = request.vars[k].file.read()
                    attachments.append(dict(payload=payload, filename=filename, mime="text/plain"))
                else:
                    # Here we use the file path to instantiate the Attachment object
                    attachments.append(mail.Attachment(filepath, filename=filename))
        """
        Now you just need to use mail.send(...) for non-draft or
        imap.<draft box>.insert(...) for draft emails passing the
        attachments and the message values collected
        from form.vars
        """
        if form.vars.draft:
            message = imap.draft.insert(subject=form.vars.subject, attachments=attachments, draft=True, mime="multipart/mixed")
            message = "You just created a draft message with attachments with id %s" % message
        else:
            message = "This form is for draft messages only"
    return dict(form=form, message=message)

View (default/index.html):

    <h3>{{=message}}</h3>
    {{=form.custom.begin}}
    {{=form.custom.label.subject}}{{=form.custom.widget.subject}}
    {{=form.custom.label.draft}}{{=form.custom.widget.draft}}
    {{=INPUT(_type="button", _value="New attachment", _id="addAttachment")}}
    <ul>
    {{for x in range(10):}}
    {{=LI(form.custom.label["attachment_%s" % x],
    form.custom.widget["attachment_%s" % x],
    _style="display:none", _id="attachment-%s" % x)}}
    {{pass}}
    </ul>
    {{=form.custom.submit}}
    {{=form.custom.end}}
    {{=SCRIPT("""
    var attachmentsCounter = 0;
    // This will make a new attachment field to show each time
    // the user clicks in the new attachment button
    jQuery("#addAttachment").click(function(){
    if (attachmentsCounter<11){
    jQuery("li#attachment-" + attachmentsCounter).show();
    attachmentsCounter++;}
    });
    """)}}