If you have questions about the use of FieldTrip, you should post them on the email discussion list.
If you want to report a malfunctioning of the FieldTrip code, please use the bug tracking system. The easier it is for one of the developers to reproduce the bug, the more likely it is that we can fix the problem for you. Good bug reports include a small testscript and the data (i.e. mat file) required to reproduce the bug.
For questions that are not suitable for the public email list, e.g. potential contributions to the toolbox or requests for organizing a local workshop, you can send an email to Robert Oostenveld (r.oostenveld at donders.ru.nl) or Jan-Mathijs Schoffelen (jan.schoffelen at donders.ru.nl).
If you like FieldTrip, you can show us your appreciation by sending us a postcard to:
Donders Centre for Cognitive Neuroimaging
P.O. Box 9101
NL-6500 AH Nijmegen
In general it is not a good idea to send data as email attachment to the email discussion list. You should consider that your data file will end up in ~700 email inboxes of all other people that are subscribed.
If the data that you want to send is too large (i.e. larger than one MB) to send to one of the developers in person, then you can upload it to ftp://ftp.fcdonders.nl/pub/incoming. Note that this is a write-only dropbox, so you (and others) will not be able to see what is copied into that directory. Within the Donders we are able to see the full directory content.
Alternatively you can use one of the file sharing methods below:
or one of the other file sharing methods that is described here. So instead of sending the large file as attachment, you would just send the download link.