With so many thousands of sites being submitted daily, it makes sense to keep your listing 'fresh'. Anything more than once a month is too much for most engines. The 'spamming' comes from people submitting the same URL over and over too often which can penalize your listing or cause you to not get listed at all. Simply email us with your domain in the subject along with the updated information and we'll include it for your next submission. After the submission, I'm receiving some 'failure' emails.
Failures are a normal part of submitting to thousands of places.
Because of server maintenance, high traffic downtime, etc. Our software engines are updated monthly which means the number of places can change from month to month. If too many failures from a particular place keep popping up, they will eventually be removed. There are only a few major engines. There are two thoughts for this.