[Plugin: MailPress] Mailpress Batch LOG File – failed sending mails

Hello,

I´m having doubts about the mailpess Batch Log file. Please can you take a look here in this LOG and tell about these ‘failed’ mails:

http://www.heliocristovao.net/dev/wp-content/plugins/mailpress/tmp/MP_Log_0_mp_process_batch_send_20120614.txt

I see 30 fails at a time…
Weren´t these mails really sent?
anything wrong?

Thanks for helping.