It appears each user can set his/her own subject header. 

I am trying to set one by default, but not sure it is affecting all existing users. We’re sorry
for all these setting up messages, but we should be almost there now.
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Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952