Open azumakuniyuki opened 5 years ago
MXes of iCloud reject an SMTP connection which a hostname of HELO/EHLO command argument could not be looked up A resource record.
450 4.7.1 <neko.nyaan.jp>: Helo command rejected: Host not found
MXes of iCloud reject an SMTP connection which a hostname of HELO/EHLO command argument could not be looked up A resource record.