HTTP Error 500 on trying to create a list in web ui

[Aanand]

While running mailman3 on local server when creating new list, sometimes it gives HTTP Error 500: A server error
occurred. Please contact the administrator
The whole error log in terminal

http://pastebin.com/qi2nee2V

[Aanand (aanand0071)]

You can change your mailman.cfg (cound in var/etc/ ) iinside your mailman folder. by adding this
"[mta]
incoming: mailman.mta.null.NullMTA
outgoing: mailman.mta.null.NullMTA"

[Ankush Sharma (black-perl)]

Why are you changing the MTA for the mailman ? And, why NULL MTA ? As far as the error is concerned the mailman-core cannot find the `Postmap` utility of `Postfix` and I guess pointing MTA settings to use `Postfix` would work. Give a try !

[Aanand (aanand0071)]

It worked in my case, I was having the same problem.

[Sumana Harihareswara (sumanah)]

Can you check whether this still happens with the latest version of Postorius trunk? Thanks!