Advertise unlimited e-mail; but cap 200 at e-mail per hour. You can run into this quickly with shared hosting plans, they don
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't have any way to investigate which domain or e-mail account is the account that is maxing out. So if you resell service to several clients, one client can take down e-mail for all your clients.
Mochahost upgraded servers, but left it to their clients to migrate all e-mails and website data to new servers.
Another time e-mail went down, they changed the IP address of the e-mail server; but didn't change the DNS settings on their servers... took 5-6 support requests to get that resolved.
IMAP mail syncing is throttled, if you have an inbox larger than 1GB you will likely experience delays in receiving e-mail.
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