How do I increase the mail - retry before fail delay for Sendmail being used as an email relay server?

I have a Sendmail server that accepts email for my domain, it then relays those emails to another sendmail server within my network that has a dynamic IP and is not always online.

For this reason I would like the retry time before failure to be increased to 7 days.

How can I achieve this?
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You can tweak the m4 config of sendmail or modify the sendmail config directly:

M4 Variable Name: onfTO_QUEUERETURN      
Sendmail Configuration: Timeout.queuereturn
Default value: 5d

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