Having issues with your host erroring out? Email might be the culprit. Below is an awesome writeup from photographer Shaun Scade who has taken the time to write up a solution. Thanks Shaun! Let's give him props!
I have attached below some of the forums I referred to and their discussions.
There seems to be hostgator and mac bashing back and forth but it should give you an idea as to how things are going. The Apple IMAP system (and blackberry, and other systems apparently) are accessing the mail server once for each account and mailbox. For example, any one email address will open 4 separate processes for INBOX, DRAFTS, TRASH, and SENT. With mac's IDLE setting it then holds them open so that when a new email comes in it will immediately notify you instead of checking every 5 to 10 minutes. So right there, you have 4 processes running and hostgator allows a max of 25. Once you hit 25, your website is automatically disabled. If you happen to have more than one computer (like an iPad, or iPhone), the number of processes increases by 4 for each system. So, say you have a desktop, laptop, iPhone, and iPad -- you are at 16 processes. That is fine unless you have 2, or 3, or more email accounts -- then you are in trouble.
We have 3 people working here, an info account, 2 iPads, 2 iPhones, 2 laptops, and 3 desktops. Therefore our site would go down constantly. One option is to use Thunderbird, and/or disable the IDLE function, allow it to only open one box at a time, to check every 10 minutes, and hope that they all don't check at the same time -- still not ideal.
I read on one of the forums that a user found success with google apps. If you have less than 10 users, it is free. So I signed up for it, created my 5 accounts, migrated my old mail into the new accounts, and transferred the DNS settings of the mail server from hostgator to google. So now i get the benefits of gMail's excellent spam protection over hostgators (relatively limited) spam control. In addition, there are no limits with your IMAP connections, and a bunch of other benefits of the google apps system.
I hope this helps out some of the users. I have read that site5 is actually even more stringent when it comes to server resources, so if your users are hosting IMAP email and their websites on these hosts, they could run into a few issues.
Here is the google apps page
It is a really well done wizard that helps you through the entire process. It even uses your domain name in your email accounts so it is seamless.