I have tried sending a newsletter from the newsletter section in Magento but it is not sending. I am new to this stuff so not sure what the issue is. Please help.
Please follow these below step:
1- Check if Magento cron is running by looking into cron_schedule table. There should be resent records for newsletter queue listed in the table and status of the module execution.
2- Run cron service manually by pointing your browser to http://your.magento.url.here/cron.php
3- Enable PHP mail log: http://php.net/manual/en/mail.configuration.php#ini.mail.log
4- Check outgoing mail queue on server with mailq command
5- Try to send all mail via external mail server by installing one of the SMTP extensions: http://www.magentocommerce.com/magento-connect/smtp-pro-email-free-custom-smtp-email.html
6- Ensure that newsletter messages are not ending up in Spam folders.