Qmail + Plesk = Help me

Ok guys…I’m nearing insanity here. Bottom line mail is sitting in the queue for some unknown reason. Newer mail is being sent out before older mail which is also bazaar.

Emails are virtually identical in nature and small 1.35kb. Simple notifications from my system letting the user know they have a new pm or password resets. No spam, no mailing listings. Just individual emails. I can receive email no problem. I can send mail from me@mydomain.com to my gmail account and I get it in anywhere from 1 hour to 1 day. Mail from my domain to users can take g%d knows how long.

They continue to pileup with no end in site.

Anyone who can point me in the right direction that would be greatly appreciated.