Anyone there?

Donamix, do the search before posting, this topic has been discussed already. There's a user who has an invalid e-mail according to the phpmail function, who has "-" or "_" in front of "@" sign, Find this user in the admin panel and suspend it, after that you'll be able to mass mail. 

Yea, i already searched that,

I have over K members on my sites

I searched by email in admin panel for -@ and _@

Both No users found.

You won't be able to find a user using only these symbols via Admin Panel, it requires full e-mail. You can do that in phpmyadmin. ow_base_user - do the search, don't forget to change operator in the drop down list to Like %...%

I did exactly the same as what you said and deleted them from there, and im still getting the below error in admin panel after sending a mass mail :)

well, obviously you found not all of them, someone has invalid e-mail

Really? like what? i looked for invalid emails you said

what more invalid mails are left?

rossYesterday, 02:29AMwho has "-" or "_" in front of "@" sign in his/her e-mail

Seriously why can't you be more clear?

I've done exactly the same as what you asked me to do

it still did not solve my issue.

there's should be an e-mail in the error who you have to delete: 

#0 /home/theopenr/public_html/naughty/ow_system_plugins/admin/controllers/mass_mailing.php(192): BASE_CLASS_Mail->addRecipientEmail then the e-mail you're looking for