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Old 4th June 2010, 19:31
MxToolBox MxToolBox is offline
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Dealing with Blacklists can be very frustrating, but that is where we can help!

If you are having problems sending to major ISPs, we would recommend checking:
Blacklists - Choose the Detail button next to any that you are listed on for more details. If you need more info on what a Blacklist is, read this blog post.
MX Records
Reverse DNS records
SMTP Diagnostics - this tool checks for Open Relay, HELO response and more.

This is a great start to make sure that your mail is being delivered accurately and on time. Keep in mind that while you may pass all of these tests each recipient server administrator can adjust their mail filters however they like, which might end up putting your mail in the Junk folder. It is really up to the users of the system to give feedback to their administrators so that filters can be adjusted accordingly.

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