Geralmente encontramos no Sendmail o error log abaixo:

Nov 15 08:19:56 server sendmail[314]: [ID 702911 mail.crit] My unqualified host name (localhost) unknown; sleeping for retry

Nov 15 08:19:56 server sendmail[315]: [ID 702911 mail.crit] My unqualified host name (localhost) unknown; sleeping for retry

Nov 15 08:20:57 server sendmail[314]: [ID 702911 mail.alert] unable to qualify my owndomain name (localhost) -- using short name

Nov 15 08:20:57 server sendmail[315]: [ID 702911 mail.alert] unable to qualify my owndomain name (localhost) -- using short name

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