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Domain and IP Whitelisted; Still No Mail

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saracen View Drop Down
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    Posted: 24 October 2008 at 5:39pm
We have several clients who are using the same ISP and mail hosting company. We have added their IPs and their domains to our white lists and we still are unable to receive email from them.

I've even communicated with the provider directly and confirmed the address they send their outbound email through and made sure that IP was whitelisted and still nothing is getting in or showing up as quarantined.

All of our clients and associates state they are receiving notices that their is a problem with their IP address.

I've communicated with the ISP that this appears to be an issue they need to rectify but I was hoping to see if there was any other explanations for what's going on.

Shouldn't the white listing overide this behavior?

Thanks.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2008 at 6:27pm
saracen,

There are two cases where connections are dropped even if the IP is in the whitelist.

1. The greylist filter. IPs will be subjected to greylisting even if they are present in the whitelist. There is a separate method of adding IPs to an exception to prevent them from being stopped by this filter (http://www.logsat.com/spamfilter/Forums/forum_posts.asp?TID=6379)

2. The "IP blacklist cache". If an IP has been sending spam during the last few minutes, it will be temporarily blocked at a TCP level, regardless of the IP whitelist.

It is to be noted however that in #2 above, if the IP is whitelisted, it won't be blocked by the other filters, so the email should never end up in the blacklist cache to begin with...

For the greylist in #1, greylisting very, very rarely will block legitimate IP. The (again very rare) times this happens, it is usually caused by the remote server having many different IP addresses which are used to send emails, not just one.

All this said, if you can please zip and email us at support at logsat.com SpamFilter's activity logfile for a day this happened, we'll take a look. Please also include the sender's IP address in question.

If the zip is over 5MB in size, please use our FTP site to upload the file. I'll send you the FTP login info in a PM.
Roberto Franceschetti

LogSat Software

Spam Filter ISP
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