Most likely none of you would consider adding +all to an SPF record a smart
move, here's another reason why you shouldn't do it:
Google cloud services are being used to spam (ongoing for a long time,
Google doesn't seem to care). What I noticed today is that the spammer is
using domains with SPF +all as sender and HELO domains, presumably hoping
to avoid SPF based rejections or quarantine.
This might lead to bad reputation for the domains involved...
Cheers,
Hans-Martin
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