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I'm the sys admin of that mail server. It's running OpenBSD spamd for greylisting.
It looks like the MTA on gateway06.websitewelcome.com gave up trying before
getting whitelisted:
<info@store.slackware.com>: host store.slackware.com[64.62.136.57] said: 451
Temporary failure, please try again later. (in reply to DATA command)
I've added all the IP addresses from SPF records of your email domain
to the PF firewall. Sorry for the inconvinience, please try again.
This is exactly why I disagree with ambiguous filtering and blacklist/whitelist/greylisting. I'm a mail admin and the most I'll use is zen.spamhaus.net blacklisting, since it is quite fair. Many of my users complain about the amount of SPAM, but personally I think any amount of SPAM is better than not receiving all HAM.
Even SPF is extreme and unescessary in my opinion. Now if only we could get all mail system admins to use a PTR record!
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