If the candle is sooty, or shows a spark in the wick on blowing out, it is a sign that a letter is on its way.
Superstition #1443
Source: Current Superstitions (1896), entry 1443.
Fanny D. Bergen, editor.

If the candle is sooty, or shows a spark in the wick on blowing out, it is a sign that a letter is on its way.
Source: Current Superstitions (1896), entry 1443.
Fanny D. Bergen, editor.