Hello, I just test your newsletter plugin for wordpress. Unfortunately I can not send mails. The mails are marked as shipped but none arrives at the recipient. Can it possibly be because I have not set up a page for unsubscribe or double opt in which the mails are not sent? Does such a page necessarily have to be created in advance?
A testmail over the general settings can however be sent, but takes extremely long until this arrives about 25 minutes.
Long delays are always due to your mail service (the one the provider supply in to your web space) since the plugin sends the emails immediately. Try to open a ticket with your provider.
And do few tests from the diagnostic panel of Newsletter. And ask the provider how many email you can send per hour.