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I am using no default client which is squirelmail. So I will provide more details next question. Thanks for asking.
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want to transfer enom domainName mailserver from justhost hosting<br />
<br />
how to sync old email (stored on desktop computer and cell phone) <br />
<br />
how long downtime<br />
<br />
What is a good mailserver<br />
<br />
Is gmail for domains now $5 a month
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want to transfer enom domainName mailserver from justhost hosting

how to sync old email (stored on desktop computer and cell phone) 

how long downtime

What is a good mailserver

Is gmail for domains now $5 a month

transfering mailserver

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.