When I run my front loading washing machine, the house begins to smell like rotten eggs.
The first time the smell appeared was when I used the washer after a period of not using it (hadn't used it for about a week). The smell did not occur before this. I ran a load of bleach through the washer, but the next day it reappeared. I do not use well water. Any suggestions..?

Don't suppose you have any rodents that could have gotten caught in the back of it?

A vent line so gas/air from your sewer line vents outside... it has to go somewhere