Cron <root@sdhg> /usr/share/spamassassin/sa-update.cron 2>&1 | tee -a /var/log/sa-update.log
error: unable to refresh mirrors file for channel updates.spamassassin.org, using old file
channel: could not find working mirror, channel failed
30-Jan-2018 06:51:34: SpamAssassin: Update available, but download or extract failed
I see those errors, too, sometimes.
I think that spamassassin update servers have some problems.
If the error is “rules: failed to run FORGED_GMAIL_RCVD test, skipping:”, then this is a new problem started today because of a “wrong” rules update. It will be fixed in a few hours by the SpamAssassin team.
Reference: https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7540