thank you for ACME and LetsEncrypt, an invaluable contribution to making the web safer.
Please add an option to the expiration notice emails to mute repetitive notices.
Expiration notices are sent, when a certificate is about to expire and it has not been superseeded by a new cert. This can happen
a) by accident
b) because the cert was changed, e.g. to include a new subdomain
c) because the domain is no longer used.
In case b and c the repeated notice can be quite annoying, so I propose having an acknowledgement link to mute notices for this very expiry.
This would allow reducing possibly irritating emails while still not completely turning off the warning system.
Thank you for consideration!