[Mailman-Users] Relaying denied

[Sylvain Langlade]

> <EXCHANGELSN.sila.local #5.7.1 smtp;550 5.7.1 ... Relaying 
> denied">fbms at vanuatu.sila.local 
> <mailto:fbms at vanuatu.sila.local> >... Relaying denied

Did you check your MTA conf files regarding IP access to the SMTP server ?
If only one IP or subnet was allowed to pass emails thru your mailman
server, and you change that IP and/or subnet when migrating to a new server,
the mailman server will reject any attempt.

HTH