as the sender of mail handler is invalid, fix this use default sender…

[jeffery9]

… address < trapperkeeper@localhost>

ERROR:root:Callback Failed: (501, ': sender address must contain a domain', 'trapperkeeper')
Traceback (most recent call last):
File "build/bdist.linux-x86_64/egg/trapperkeeper/callbacks.py", line 43, in call
self._call(_args, *_kwargs)
File "build/bdist.linux-x86_64/egg/trapperkeeper/callbacks.py", line 171, in _call
self._send_mail(handler, trap, duplicate)
File "build/bdist.linux-x86_64/egg/trapperkeeper/callbacks.py", line 72, in _send_mail
subject, self.template_env, ctxt)
File "build/bdist.linux-x86_64/egg/trapperkeeper/utils.py", line 127, in send_trap_email
smtp.sendmail(sender, recipients, msg.as_string())
File "/usr/lib/python2.7/smtplib.py", line 731, in sendmail
raise SMTPSenderRefused(code, resp, from_addr)
SMTPSenderRefused: (501, ': sender address must contain a domain', 'trapperkeeper')

[gmjosack]

This should probably be turned into a config option. I currently use a mail relay that automatically appends the domain so this would negatively affect my installation as proposed. If you want to change this to be a config option with the default remaining trapperkeeper then I'll gladly merge this.

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