[Exim] MX record as a alias vs cname

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Autore: hanasaki
Data:  
To: exim-users
Oggetto: [Exim] MX record as a alias vs cname
The following error showed up one day. Is this part of a standard or
just a local admin's setting? Yes, I have looked for the answer myself
first. Thank you for you help.


  SMTP error from remote mailer after RCPT TO:0000000000000000000:
     host 00000000000000 [IP]: 550 invalid MAIL-FROM:
     Error during DNS A lookup for 00000000000000000:
     DNS alias found where canonical name wanted [Irritated]