You can use google dorks for this for example inurl: "@gmail.com" , inurl: "@yahoo.com"
write it in google search box
enjoy
here is some result / other dorks
inurl:"passes" OR inurl:"passwords" OR inurl:"credentials" -search -download -techsupt -git -games -gz -bypass -exe filetype:txt @yahoo.com OR @gmail OR @hotmail OR @rediff
Remomber to edit google search <advanced search > to ; one weak , last mounth , last 24 h ....
to get a fresh list
enjoy
just search as shown