I tested several times the pause sending and it not works.
I send a campaign with spark server, I click on pause, and then I refresh spark I see for example 200 email sent in spark, after minutes I refresh again I see 1200 emails sent, I delete the campaign in mailwizz, I see that email continue sending.
I send a campaign with spark server, I click on pause, and then I refresh spark I see for example 200 email sent in spark, after minutes I refresh again I see 1200 emails sent, I delete the campaign in mailwizz, I see that email continue sending.