Hey, I think I found a potential solution for Plesk issue with Outlook smtp. Usually ISP's block port 25 so they won't have to relay outbound traffic. There are two ways around this actually. One way is the email server on your end provide user authentication. The other is to setup the server and the end user to use alternative ports like port 23 or port 2525. I did some research about Plesk. And they don't actually support any solution at all except to request the user to use their ISP as their outbound. However, 90% of ISP's don't want to relay email traffic. That's not a good solution for your customers and this needs to be fixed. You will undoubtedly have customers that want to use Outlook as Outlook Express is not an option. Fortunately for Tenth Tree they were ok with using Outlook Express. They were really quick to accuse Willamette Web as being the problem. But I assured them that this is an industry problem and that this will be an issue no matter who Hosts their web site. I can only make the assumption that Comcast allows traffic from Outlook Express because of it's low volume. Outlook on the other hand usually produces alot of traffic for the more serious user.
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