Thanks, Mario Carriere!
I found the file !!! It contains 80,000 lines identical to this one:
[Fri Apr 3 21:14:22 2015] [ow_core_log] [Exception] Message: Invalid argument `$email` File: /var/www/vhosts/somoscd.es/httpdocs/ow_system_plugins/base/classes/mail.php Line:67 Trace: [#0 /var/www/vhosts/somoscd.es/httpdocs/ow_system_plugins/base/bol/user_service.php(1304): BASE_CLASS_Mail->addRecipientEmail('jlcarras.@eresm...') | #1 /var/www/vhosts/somoscd.es/httpdocs/ow_system_plugins/base/bol/user_service.php(1338): BOL_UserService->sendWellcomeLetter(Object(BOL_User)) | #2 /var/www/vhosts/somoscd.es/httpdocs/ow_system_plugins/base/cron.php(59): BOL_UserService->cronSendWellcomeLetter() | #3 /var/www/vhosts/somoscd.es/httpdocs/ow_cron/run.php(128): BASE_Cron->run() | #4 {main}]
The problem is ultimately the email "jlcarras.@eresmas.com" , I exchanged emails with him from my gmail account, is checked, that's right.
It seems that Oxwal have a problem with item, the error comes from '.' '
I created an email with this feature in my domain, I have registered in my network and same thing happens.
Any idea to patch Oxwall?