Have been using the Contact Form 7 plugin for years now. I've never had a problem with it. Excellent plugin. I use it on this page: http://www.pushsquare.com/about/
It sends an email to my primary address: sammy_nospam@pushsquare.com. I've made no changes to the structure of my WordPress set-up, but in setting up a new contact form (for a competition) today, I've noticed that Outlook has stopped downloading the emails, despite the form giving me the "Successful" message.
I investigated further, and changed the destination of the form to my back-up email address: get2sammyb_nospam@gmail.com. The emails went through instantly, and appeared in my Gmail inbox.
I figured it was a problem with Outlook, so instantly downloaded Mozilla Thunderbird and set it up with my @pushsquare.com account. I sent a new message through, only to be informed by Thunderbird that "there are no emails on the server".
I tracked my email records back, and noted I haven't received an email through my Contact Form since January 26th, 2011. It's unusual because I normally get at least one message a week.
My @pushsquare.com email account is sending and receiving emails fine. Likewise the contact form appears to be spitting out emails as it works with my Gmail account.
Admittedly I'm a little bemused. If the form is sending emails and Outlook/Thunderbird are working fine, where are these emails getting lost?
Thanks very much in advance.