Social Login Facebook

I am using social login addon for facebook integartion.I can sign in properly using facebook.But for new customer it is giving me following error :Error Message could not be sent.

Mailer Error: SMTP Error: The following recipients failed:

SMTP server error: Verification failed for 550-No Such User Here 550 Sender verify failed .Please see the attached screenshot.Please help.

Thank You.

Screenshot from 2015-02-10 17:35:20.png

I have using social login and this good worked till I upgrade PHP+Apache (maybe some else) then I have see Error message when user try log in via social login modile.

When I try to login cs card send a message lang_var "hybrid_auth.unspecified_error" . In russian its look - Ошибка Неизвестная ошибка, обратитесь к администратору магазина.

What is can be?