83f17e5c___International_Bulk_Mail_T_Cs__Actions
[No] 6.6.9 [Issue] Mail that do not bear the mode of transmission service indicator (Eg: by air, by sea). [Actions] 
The PPI Permit Holder shall indicate the required indicator or the items may be sent by the cheapest mode to the destination.
SingPost - International Bulk Mail T&Cs
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