We see entries like this in the qmail/send log when clients try to send to a particular domain:

2018-01-18 14:49:03.821437500 starting delivery 93767: msg 21453716 to remote mvelasq...@prevenir.com.ec 2018-01-18 14:49:39.016795500 delivery 93767: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/

Does anyone know what this entry is trying to tell us? and what would a CNAME lookup have to do with sending email?


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