Session level reject

Imported from previous forum

[ original email was from Le Floch mikael - mlefloch@caicheuvreux.com ]
Hi,

i’m a sell side and i would like to know how to manage this case

Every time that a message is undeliverable, The network generates a session level reject for those messages, but on a network like ROR my FIx session is UP and i have no idea if my client on this network is UP with ROR.

When can i decide to resend the message which hasn’t been delivered ?