Half of emails from email campaign get stuck in email queue

[Rezae]

Hi
I am using
Sugar CE Version 5.2.0a (Build 5447)
Ubuntu 8.10 Interpid
Apache
MySQL

When I try to send an email campaign to 350 contacts, about 100 of them get send in the midnight and the rest get stuck in outbound Queue and when I try to send the rest manually using "Send Queued Campaign Email" nothing happens.

Any idea what I can do to fix this? The number of contacts in my target list is about 300-350 contacts.

Any help in resolving this would be much appreciated. I have searched various formus but have not had any luck in finding a fix for this.

Many thanks

[Rashelinu]

I use de comunity eddition 6.1.2 on linux and I have the same problem. The Campain I did has 100 leads and there is one lead stucked in the queue. The "attempt to send" number specified in the queue page is 0, even if I press the button "Send Queued Campaign Email" a lot of time.

Any help would be really great!