By default, accounts that are created when you send a file to a recipient that is not defined in EFT Server, the account expires after 7 days. You can configure the number of days after which the account is to expire or configure the account to not expire.
To configure temporary account expiration
In web.config or in the IIS properties, set the variable ExpiryDays to the number of days after which the account is to expire or 0 (zero) if you do not want the account to expire.
You can still expire or disable the account later in the EFT Server administrator interface.
Refer to Secure Ad Hoc Transfer's Configuration File for details of editing the configuration file.