Feature request, option to only log mail which aren’t deliverd

Hi,

I would like to request a few features.
– Option to filter on mails which aren’t delivered
– Option to only log mails which aren’t delivered
– Log mails to a file like woocommerce logs errors for example (1 log file for each day)

I ask this because I installed the plugin this week on a webshop were we send a lot of
confirmation mails. But its hard to figure out if there are mails which aren’t delivered because I can only see 100 per page and we have already send more than 100 in one week.
It sometimes happens that there goes something wrong while sending a confirmation mail.
Then I want to quickly see which mails weren’t send and resend these again.

Thanks you in advance!

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