nondelivery
Refers to the failure of a message, package, or email to reach its destination. Often used in postal, logistics, or digital communication contexts.
The email failed to be delivered.
In case of nondelivery, we will resend.
Compound of 不 (fu, 'not') and 達 (tatsu, 'reach' or 'deliver'), literally 'not reaching'. The reading ふたつ is the on'yomi of the kanji.