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Deferral in qmail: CNAME_lookup_failed_temporarily. _ (# 4.4.3)

I tried to send e-mail from the system to realize fax transmission.
However, I attempted to send to eFax’s e-mail address (domain part efaxsend.com), but in the
qmail mail log

Deferral: CNAME_lookup_failed_temporarily. _ (# 4.4.3)

It is recorded as a differer and can not be sent.

As a cause,

I can not resolve the destination host in DNS.

Although it can be considered, it was confirmed that it can be normally dragged with the dig command.
There is another reason.

Qmail gives an error of DNS response of 512 bytes or more

It seems to be the cause. At the time I saw efaxsend.com MX records, there were 16 MX records.
The patch has been released.

Http://www.ckdhr.com/ckd/qmail-103.patch

You can apply this patch or directly by specifying the destination SMTP server addressed to the given domain in qmail’s smtproutes configuration file as shown below.

# Vi / var / qmail / control / smtproutes
rmohan.com: mail.yahoo.com

However, since the other SMTP server may be changed, it is better to apply patches as well.

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