The mailing list for listmasters using Sympa

[Thomas Barth <address@concealed>]

Hi,
after sending an email to my testlist from email-client an error is
printed to sympa.log:

Jan  5 12:17:14 dev sympa[32530]: Ignoring message which would cause a
loop, sent by address@concealed
Jan  5 12:17:14 dev sympa[32530]: Moving bad file
address@concealed to bad/

But when I copy an prepared email to the msg-folder of my testlist, the
email is sent to all subsribers.

What can be the reason for the loop?

Thomas