New User Registration Email
If we use the standart "New User Registration Email" everything is fine. But if we use "Enable Custom Email:" some Users don't geht their emails (freenet and web.de). Then we get a Mail delivery failed message like this:
SMTP error from remote mail server after end of data:
host mx.freenet.de [195.4.92.9]: 550 No valid sender in Sender:, Reply-To:, or From:
What can we do? Plugin "Advanced Email Options" dosen't help.
Classipress 3.1.9
Wordpress 3.3.2