Is there a charge after email and SMS reminder?

No, like the 189 mailbox I use now, there is no extra charge. After opening, there will be a new email in the mailbox, and I will immediately send a text message to my mobile phone to inform me, so that when I receive the email, I will have an extra guarantee that important emails will not be missed. And if you don't want to be disturbed, you can also set a reminder time period, which is quite humanized.