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We started having the issue when we were on a shared server, I've since switched to our own VPS which has improved the issue a bit but we still occasionally get blocked.
I've had our host open up a new port, that didn't seem to help. Is there any way for me to check to see what is going on and to find our exactly why we are being blocked? I'm starting to get really desperate. Our IP address isn't blacklisted, I tried to email the host that is blocking us but I can't get through to them either because the email just sits in the mail queue on the server.
Any advice would be greatly appreciated.
By the way, all mail servers should have a reverse DNS that points to the correct name of the server. I can't say that it's absolutely necessary, but it's definitely desirable for spam filtering.
So using Microsoft Outlook really opens the world to spam and open relay abuse?
No, what they're saying is that it just requires some specialized setup to make it work with your mailserver. So you have to find someone that knows or is willing to do that setup. The alternative of running an open relay should not be an alternative. I wasn't even aware that people did that.
I had been asking them about the open relay setting and they just kind of brushed me off as that not being the option.
You may want to try additional or different DNS servers that your mail server uses. I seem to remember that we had a flood of mail problems some months back that was got fixed by changing the DNS entries.I recommend this too, I had this issues few times with my dedicated servers. I cannot remember the file name to be edited, there is a file that contains the DNS names (usually 2 lines), and the DNS mentioned there ware offline, that caused the email connection to fail and emails got stuck in queue.