I kind of like this 'feature' personally as it stops obvious
forged email which is the intent of SPF to stop forgeries that
spammers
use to hide their identity.
Yes, I agree.
Me also.
Checking for invalid hostnames and hostnames without MX/A records is a
common feature of MTAs. I've been using it on Exim for quite a while
now. I encourage you to use it also.
Not common enough, mine can't, but it can do SPF. So if SPF could
incorporate that for me great!
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