SMTP cnfigured in bugzillawhich is installed in ubuntu.
Given parameter>Email section in bugzilla:

mail_delivery_method = SMTP,
mailfrom =,
smtpserver = servername:587,
smtp_username = username,
smtp_password = password,

WHen i submit bug its showing like mail sent to users.
But users not getting any mail.
Its not showing any error also.
please let me know is there any other changes to do ?