There was an error when sending a confirmation email for your subscription. Plea

Get this irritating error message all the time even if I tried all options to change the settings. Please get back asap as site is live..

“There was an error when sending a confirmation email for your subscription. Please contact the website owner.”

Checked the log and this is the error, how to solve?

MailPoet is <a target=”_blank” rel=”noreferrer” href=”https://kb.mailpoet.com/article/379-our-approval-process”>reviewing your subscription</a>. You can use all MailPoet features and send <a target=”_blank” rel=”noreferrer” href=”https://kb.mailpoet.com/article/290-check-your-newsletter-before-sending-it”>email previews</a> to your <a target=”_blank” rel=”noreferrer” href=”https://kb.mailpoet.com/article/266-how-to-add-an-authorized-email-address-as-the-from-address#how-to-authorize-an-email-address”>authorized email addresses</a>, but sending to your email list contacts is temporarily paused until we review your subscription. If you don’t hear from us within 48 hours, please check the inbox and spam folders of your MailPoet account email for follow-up emails with the subject “Your MailPoet Subscription Review” and reply, or <a target=”_blank” rel=”noreferrer” href=”https://www.mailpoet.com/support/”>contact us</a>.<br/>