Greg Helledy on 23 Oct 2016 20:25:20 -0700

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]

Re: [PLUG] spamassassin help: create a rule to score by sender TLD

> I tried to reply to your email, but my server is not allowed to write to
> you:
That may (or may not) be because DNS for your mail server is configured
incorrectly.  In particular, your mail server fails FCrDNS:

	% host domain name pointer

	% host has address

I have written to Arvixe about this; they control that, not me.

In some cases, this will cause mail from your host to be rejected.
(It will here, because the check for it is switched on in the MTA's
configuration.  This has been a best practice for over a decade.)

In others, it will cause mail to deferred, or quarantined, or scored
higher on a not-spam/spam scale, or discarded.  (Note: not that I
necessarily agree with all of these, because I don't, but they are
things that are possible outcomes as you present mail to various
recipient mail systems, each of which will make its own decision
based on your DNS misconfiguration.)

Understood. I haven't been aware of any issues with mail delivery in the past couple of years, but if I can get them to fix something without too much effort on my part, I will.

Also, in re this:

> We're on a VPS, which spammers like to use, so it's not surprising that
> other IPs in our block would be on blacklists. Nothing I can do about
> that, unfortunately.
Yes. There is.  Move somewhere else.  If spammers like to use this particular
VPS, as you say they do, then there are only two possibilities:

	1. The VPS provider knows this.
	2. The VPS provider does not know this.

If it's (1), then the VPS provider is knowingly accepting dirty spammer
money.  Is this unethical company one you want to do business with?

If it's (2), then the VPS provider is incompetent: they're unable to
stop their own operation from being abused, which is ridiculous and
pathetic.  Is this incompetent company one you want to do business with?

It looks like I was less than clear. I don't believe it's my provider in particular that spammers like to use, but all providers of VPSes in general. I believe Arvixe discourages spammers, but as with spam itself, I'm sure a few get through sometimes and crank out some spam before they notice and pull the plug.

As an aside, your IP address is presently on the AHBL, but not on
any of the other major DNSBLs that I just checked.  However, I made
only a cursory survey and not an exhaustive one, so it's entirely
possible you're listed by some of the hundreds of others that I
didn't bother checking.

Well, we've never generated any spam, but apparently one can get on a list even so. Our ability to send mail seems to be good enough for our needs, the only domain I've found in nearly two years we can't send to is and we don't have any business there. But if Arvixe will fix the reverse DNS issue, I'll be happy.
Greg Helledy
GRA, Incorporated
P:  +1 215-884-7500
F:  +1 215-884-1385
Philadelphia Linux Users Group         --
Announcements -
General Discussion  --