Ignoring the odds, obtain mail, but it's not very interesting (5)
I believe the answer is:
banal
'it's not very interesting' is the definition.
(I've seen this in another clue)
'ignoring the odds obtain mail' is the wordplay.
'ignoring the odds' means one should take alternating letters (letters in odd-numbered positions are removed).
'obtain'+'mail'='obtainmail'
The alternate letters of 'obtainmail' are 'BANAL'.
'but' acts as a link.
(Other definitions for banal that I've seen before include "Pedestrian" , "Tediously unoriginal" , "flat" , "Overfamiliar through overuse" , "Mundane" .)