Am i missing anything in the setting? message not sending

Hello all,
I am new to phplist,

in the config.php file i added my mail details as seen in the below section with “********************”

// when the protocol is pop, specify these three
$bounce_mailbox_host = ‘';
$bounce_mailbox_user = '
’;
$bounce_mailbox_password = ‘*****************’;

And

// if you want to use smtp authentication when sending the email uncomment the following
// two lines and set the username and password to be the correct ones
$phpmailer_smtpuser = ‘**';
$phpmailer_smtppassword = '
’;

And when i try sending message from phplist admin i got the below messages

Started
Processing has started,
One campaign to process.
Please leave this window open. phpList will process your queue until all messages have been sent. This may take a while
Report of processing will be sent by email
Processing campaign 2
Looking for subscribers
Found them: 1 to process
Warning: script never reached stage 5
This may be caused by a too slow or too busy server

Did i get the above config.php file setting correctly?

Are there other things i need to to do to start sending messages successfully ?

phplist 3.6.15?

Regards
Over

@Overcominglove Look on the Event Log page for any error reported. Possibly the email address is not valid.

Thanks @duncanc,

I checked the event log page and discovered that the sender email address was wrong, i updated the email address and was able to send campaign successfully.

Thanks again