Given this, perhaps you could add a note suggesting that one or the list of blocks should be added when they reregister their gateway, that would eliminate any confusion... just my two cents.

This better:

—8< SNIP >8--- Hello {givenName},

This is a system generated email from the AMPRNet Portal.

This is a courtesy notice to advise you that your gateway entry has been removed.

Your gateway was removed by an automated process that looks for gateways that have had no attached subnets for at least one week.

Your gateway has met this criteria and has thus been removed.

It is important that the Portal data is kept up to date and accurate. If you still want to run a gateway, please feel free to add your gateway back to the Portal.

Your gateway's details were: Title: {gwTitle} IP: {gwIP} Host: {gwHost} Notes: {gwNotes}

You have the following subnets allocated to you: {listOfSubnets}

If you add your gateway back, please ensure that you allocate at least one subnet to it, otherwise this process will remove your gateway again in a week!

Kind Regards, The AMPRNet Team —8< SNIP >8—