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I have checked the email address associated with your account and found out that it is on the bounce listResult: r*********ns@2ch***************te.com is IN the bounce list
Reason(s) : smtp; 554 4.4.7 Message expired: unable to deliver in 840 minutes.<421 4.4.2 Connection timed out>
I have removed the email address from the list. However, so you could prevent something like this to happen again in the future, I suggest you check out this guide: How-to-Prevent-Email-Bouncing-Related-Issues
You can also try Whitelisting-JotMails-IP-Addresses
Please try to test your email notifications and let us know if you still need any further assistance. Thank you.