qmail echo "My Mail Server Real Domain Name (A Record)"> / VAR / QMAIL / Control / HeloHost Postfix Postconf -e "SMTP_HELO_NAME = My Mail Server Domain Name (A Record)" Sendmail Vi /etc/sendmail.cf CW My Mail Server Domain Name (A Record) SINA needs to parse the Heloname's A record, if this A does not refer to the mail server, it will definitely be rejected.
