Forum All email and password notifications are not working after upgrading to vb4.2.0 pl2
 

After upgrading my forum to version 4.2.0 Pl2, all email and password notifications are not working to all users.
Also, I tried to send an e-mail to a specific email addresses manually from an admin cp but also failed and didn't send.
I ran mail diagnostic test, it revealed me "no problems in sending e-mail" But I didn't receive any email as per diagnostic test.

Help please

my site: www.egyptianoasis.net
Vb 4.2.0 PL2