or mail boat
Origin of mailboat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for mailboat
Don't you know that it is rather a serious thing to delay a Spanish mailboat?
Wyndham was wanted at home, the ebb tide was running and a mailboat was due to call at Takana lagoon.Wyndham's Pal
Leaning on it he looked down on the water and on the mailboat clearing the harbourmouth of Kingstown.Ulysses
The afternoon passed in preparation of monthly reports scheduled to go on the mailboat expected in that evening.Terry
Charles Goff Thomson
I don't expect him until he calls for his man—the one I've just hove out—when the West-coast mailboat comes in.