I have sent out newsletter through my website. After sending the newsletter to around 300 customers, all my futher emails will be bounced back with the error message of 'unrouteable address'. This happends within 24 hours or so, and after that the email system will be recovered.
Please advise what can I do to avoid further emails being bounced back after sending newsletter.
Thank you!
Please advise what can I do to avoid further emails being bounced back after sending newsletter.
Thank you!