Not sending mail for a couple of days is probably not an option - which would be the case if SparkPost was your mail delivery agent.
SparkPost should be the one taking it's time.
We also had a funny experience with SparkPost. Sent millions of mails with them. Suddenly one day 1(!) mail go through, which actually is a notification mail to one of our site admins, asking if he want to allow a comment on a page - a spam comment in this case, and SparkPost suspends our account.
Comments
Not sending mail for a couple of days is probably not an option - which would be the case if SparkPost was your mail delivery agent. SparkPost should be the one taking it's time.
We also had a funny experience with SparkPost. Sent millions of mails with them. Suddenly one day 1(!) mail go through, which actually is a notification mail to one of our site admins, asking if he want to allow a comment on a page - a spam comment in this case, and SparkPost suspends our account.