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DNS message

kitbsonkitbson Member Posts: 35 ■■□□□□□□□□
in Linux+
HI,

What is the problem of this message ??
421 DNS temporary failure at return MX check

Thank You.
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    sprkymrksprkymrk Member Posts: 4,884 ■■■□□□□□□□
    It's an error message, likely from a sendmail server (but possibly postfix or others too) saying it can't find a DNS MX record for another mail server. This could be due to any number of issues including network problems (can't contact a DNS server), DNS problems (server is down or there is no MX record), or something. Many times that is only a temporary delay, and once a DNS server with the appropriate MX record can be contacted the mail will be delivered.
    All things are possible, only believe.
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    kitbsonkitbson Member Posts: 35 ■■□□□□□□□□
    Thank You ~
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