I am using dynadot mail service more than a year. Recently, I realized that some emails arrives 2-3 hours later. If I send a test mail from my yahoo account, there is no problem. What is the problem about this? Maybe it is a time-zone related problem.
What about this problem? Yesterday, one of my clients send me a mail, and it arrived me 9 hours later! I think your mail server is misconfigured. Because, the same mail is arrived immediately to my yahoo account...