Send email works for one user and not another ?!

Hi there
Am Apex Newbie and am developing in-house helpdesk / ticket / call logging / issue tracker type system ..
Am putting final bells and whistles on app like sending email on raising of a problem. This is being done via Apex_Mail using new Send Email page process attached to a button.
I.e it's not being done via UTL_SMTP explicitly in a trigger or anything.
Here's the problem for userA the sending of email works perfectly for userB it doesn't work .. does anyone have any suggestions as to what may be wrong ?
I thought I read somewhere that UTL_SMTP wasn't granted publicly in Apex and had to be explicitly given to individual users but I may well be mistaken.
Any help / suggestions gratefully received .. all I can think of doing is logging onto Apex Admin and looking at the mail queue and see if that will give me any clue but Apex Admin is not really my bag per se ?!
Thanks in advance
Wiggywig

Hi,
Can you see any error from Apex logs?
Check mail queue and mail log
http://download.oracle.com/docs/cd/E17556_01/doc/admin.40/e15521/adm_mg_service_set.htm#sthref348
What email address you use in From field?
Somehow I think this relates more to SMTP server policy about sender than Apex.
Regards,
Jari

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