hi arnieh
I had the same problem.
It seems that some pluging is fighting with mailpress.
I switched each plugin and tested mailpress on each individual plugin.
Surprisingly, it works now properly. Here is the list of ENABELED ADDONS:
AJAX Comment Preview
Akismet
All in One SEO Pack
Contact Form 7
Event Calendar
Event Calendar Widget
MailPress
MailPress_autoresponder
MailPress_bulk_import
MailPress_connection_phpmail
MailPress_deregister_scripts
MailPress_extra_form_mail_new
MailPress_IP_user_info
MailPress_mail_custom_fields
MailPress_newsletter_categories
MailPress_tracking
Sexy Comments
Shadowbox JS
Smart Map
Stray Random Quotes
WordPress.com Stats
WP-Cumulus
WP-Print
I have not tested the issue with theos addons. but they where enabeled when Mailpress had that issue ( so most likley its one of theos addons ):
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