"Let me recommend you to hold your breath."
Like most, you turn to Plato's Symposium for advice handling a hiccup, of course: if, after holding your breath — as the physician Eryximachus has recommended —, the contractions continue, you "gargle with a little water; and if it still continues, tickle your nose with something and sneeze; and if you sneeze once or twice, even the most violent hiccough is sure to go."
Now, you want to rid not only yourself of diaphragmatic hiccoughs but also your Gmail Inbox of newsletter hiccup? Don't let me recommend it, but you may be able to hold your breath doing it:
›› Don't go hunting for instructions how to unsubscribe or links to follow when Gmail can provide a two-click leave-this-list process.