Mass Mailer / Chron issue

I have a mass mailer that gets "stuck" - the queue will form, but it never goes out.  in fact it doubles - it puts twice as many messages as there should be there.  We have tried two different chrons, neither works for the mass mailer, but everything else on the site seems to work. I don't know chrons that well.  The first one was developed with the help of Zarcon to get the video processing to work, and is now temporarily disabled.  The second one was done by a developer I am working with, but it doesn't send the messages out either.

cd /var/www/vhosts/mysite.com/httpdocs/periodic; /usr/bin/php -q cron.php

/usr/bin/php /var/www/vhosts/mysite.com/httpdocs/periodic/cron.php > /dev/null 2>&1

Any suggestions on this?  Seems like others here have had similar problems with the mass mailer, but I couldn't find the answer on a search.   I hate to fix one issue, and break another, as I would still like the video processing to work if possible.

trolling again......

what version of dolphin are we referencing here? 

sys_cron

runs the control on queue

could be something with your localhost smtp

Hello!

At me a similar problem.
Dolphin 7.0.5

When I subscribe for something the message on a subscription comes. On page "Subscription" there are new messages (on what particularly I have subscribed). But any notices at change of a theme of a subscription don't come.

In AdminPanel in section MassMailer I see as the turn of letters increases by sending.

I have registered cron.php on server Apach in CronJob (as it is written to instructions), but it has changed nothing.

I have started cron.php manually some times. And it too has changed nothing. Notices and haven't come - probably remained in turn.

All similar problems which were described at a forum, dared start cron.php. I while it hasn't dared.

As there is a problem with sending of messages in a site. Messages don't reach the addressee, especially when I tick off about the notice of the addressee on the message. I suspect that a root of these two problems one...

Prompt, please, as where to look!