"Bad recipient address syntax" error when the domain name for the recipient contains special characters Issue When the domain section of the email address of a user in an instance is an Internationalised Domain Name (IDN), the instance will not be able to send emails to that user. "501 5.1.3 Bad recipient address syntax" will be noted in the error log.ReleaseAll releases.CauseServiceNow email system does not support Internationalised Domain Names (IDNs). ResolutionPlease convert IDNs to Punycode and save the email address in your instance with the Punycode equivalent. For example, test@özelalanadı.com must be saved as test@xn--zelalanad-z7a27d.comRelated LinksWhat is Punycode? Punycode is a special encoding used to convert Unicode characters to ASCII, which is a smaller, restricted character set. Wikipedia There are several sites and libraries available for Punycode conversation.