"Contact Us" page no longer working

The "contact us" form has started returning this error message when someone tries to email us: "Sorry, my system does not understand your email address. Please try again."

The text in the subject line also jumps up to the email address line once the error displays, which seems weird.

It did work as of a few weeks ago, and the only thing I've changed since then was to shift to PayPal Express from Standard. No upgrades or anything major.

Thank you for any help!

or anything major.

So you HAVE made some changes?

Oops, I think I only replied to picandnix first.

I added some downloads to the catalog and enabled a banner.

Try logging into admin, configuration, email options. On the contact us dropdown list what do you have?

It's blank right now.

panxa:

It's blank right now.

Shame, that's exactly what I was going to suggest doing.
Ok so do you have any logs in your cache folder?

Yes, debug logs like this "myDEBUG-1346183316-828128.log". Two from the end of August, the rest from when I first installed.

panxa:

Yes, debug logs like this "myDEBUG-1346183316-828128.log". Two from the end of August, the rest from when I first installed.

none of the content of them related to this issue? What happened in the end of August?

They are > PHP Fatal error: 2008:MySQL client ran out of memory :: select configuration_key as cfgkey, configuration_value as cfgvalue

                      from product_type_layout ...

and > PHP Warning: mktime() expects parameter 6 to be long, string given in ...

Aug 28, day of the second error, is when I switched from Paypal Standard to Paypal Express.

Can we have a link to your site please?

http://www.2dcomics.com/couscous/store/

and the contact page is http://couscous.2dcomics.com/store/index.php?main_page=contact_us&zenid=faa0477d401216def7e7a5ea8e924db5

panxa:

http://www.2dcomics.com/couscous/store/

and the contact page is http://couscous.2dcomics.com/store/index.php?main_page=contact_us&zenid=faa0477d401216def7e7a5ea8e924db5

First thing that jumps out is that you have one address with www. the other without, which are you using? Fix that in your includes/configure.php file then post back. They both need to be the same, www. or non www.]

Thank you for responding earlier! Turns out it was some broken code on the contact_us.php page and is now fixed.

picandnix:

First thing that jumps out is that you have one address with www. the other without, which are you using? Fix that in your includes/configure.php file then post back. They both need to be the same, www. or non www.]

Don't forget to fix this issue through :-)