[RobOnTheCape]

I have MS Outlook, Thunderbird and Mac mail installed on my MacAir, however, I use Mac mail mostly. However, I often find that if I'm talking to someone and they need to send me a verification request, or if it's a confirmation email Mac mail takes much much longer than the other two. Outlook will get the confirm almost immediately, whereas Mail might take 5 minutes. Is this a settings issue?

Thanks