Notification broken on New Listings

Hi,
I’m still struggling with the notification issue when a new listing is been submitted by users.

Other notifications mails are working as supposed to (New User, Enquiry and Mail to friend).
Wp Mail Bank and Mail From are now deactivated in order to see where is the problem coming from.

It took more than a week to have this final answer from the BlueHost support:

The issue is with the plugin, when it is trying to enter this part, “+++ 1Xsgae-0006Gw-G1 has not completed +++
2014-11-23 16:29:12 1Xsgae-0006Gw-G1 H=localhost (box751.bluehost.com) [127.0.0.1]:42550 F=<[email protected]> rejected after DATA: syntax error in ‘Reply-To:’ header when scanning for sender: missing or malformed local part (expected word or “<“) in “Dominicana Solidaria”.
I would review the plugin to see if the syntax is setup correctly, and try to contact the developer of the plugin to see why it’s generating that error.

Please advise,
gianni