I've just signed up for a 2nd year of web & domain hosting with them. The Website has never had a problem, but email. Jeez!
I suffered intermittent error messages for the life of the account, messages unable to be sent etc. I noticed that this was mostly in the afternoons & despite several complaints & much very careful checking of my accounts set up, 1&1 weren't very helpful. In the end, I insisted they fix the prob & they did - turned out that my ISP reset my port to 25 from 587 & once we fixed that all was hunky dory. Like getting blood out of a proverbial though.