Web.de

Web.de is next to GMX one of Germany's largest FreeMail providers. BTW my first email address was arved@web.de.
Unfortunately they have a serious problem, because in the last half year, i was not able to send mail to web.de customers:

451 4.4.1 reply: read error from mx-ha01.web.de.

451 4.4.1 reply: read error from mx-ha02.web.de.

<....@web.de>... Deferred: Connection reset by mx-ha02.web.de.