5.X.X Lasting Error: These error codes start with the range “five” and they are followed by two numbers. They commonly signify the SMTP relationship has dropped. If you try to resend the email, it'll probably continue to lead to the identical error. Unlike other bulk email companies, our cost-effective https://itsupport68888.imblogs.net/76457057/an-unbiased-view-of-email-campaign