Can I send only plain text email?

While sending an email campaign at the Template stage change the option of Only plain text from NO to YES as follows. It will change your email from HTML to the only plain text version.

What is advanced recurring option?

You can send any campaign multiple time recurringly such on 3rd day on 5th day etc or each Monday, or 1st of each month. You can set the frequency as well with Max run option (i.e how many time you want to send these emails) Campaign –> Confirmation...

How many emails were sent so far?

Open any already running campaign as follows. Then check the count of recent as highlighted below for the count of How many emails sent so for as follow You can check the individual IDs as well who received your email by click on the number of recipients as...