Scheduled email report exports failing to send due to error - An invalid character was found in the mail header: ';'.

Snow reports are failing to export with the following error logged (C:\Program Files\Snow Software\Logs\ReportExport): 

2023-04-27 06:00:01,848 [118] INFO  SnowSoftware.LicenseManager.ReportExporterService.ScheduledExportManager [(null)] - Starting scheduled export. (ScheduleID: e7b7fc09-6522-430c-bbdd-4acaffc8d876)
2023-04-27 06:00:03,754 [118] ERROR SnowSoftware.LicenseManager.ReportExporterService.ScheduledExportManager [(null)] - Failed to export report.
System.FormatException: An invalid character was found in the mail header: ';'.
   at System.Net.Mail.MailAddressParser.ParseLocalPart(String data, Int32& index, Boolean expectAngleBracket, Boolean expectMultipleAddresses)
   at System.Net.Mail.MailAddressParser.ParseAddress(String data, Boolean expectMultipleAddresses, Int32& index)
   at System.Net.Mail.MailAddressParser.ParseAddress(String data)
   at System.Net.Mail.MailAddress..ctor(String address, String displayName, Encoding displayNameEncoding)
   at System.Net.Mail.Message..ctor(String from, String to)
   at System.Net.Mail.MailMessage..ctor(String from, String to)
   at SnowSoftware.LicenseManager.ReportExporterService.ScheduledExportMailer.SendEmail(ScheduledReportInfo exportInfo, String additionalBody, Attachment attachment)
   at SnowSoftware.LicenseManager.ReportExporterService.MailReportDelivery.Deliver(IExport export, ScheduledReportInfo scheduledReportInfo)
   at SnowSoftware.LicenseManager.ReportExporterService.ScheduledExportManager.<ExportAsync>d__23.MoveNext()

Cause

• 2 emails addresses were present in the In the SMACC > Core settings called "NOTIFICATION_SMTP_SENDER" & "REPORT_EXPORT_SMTP_SENDER". 
• Both were separated by a semi colon as shown below:

Resolution

• After removing 1 of the 2 email addresses and retesting, the reports are now sending successfully.