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I have a customer who wants to be able to send and receive email THROUGH their firewall to their mail server (Imail 11). &nbsp;<br />
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Aside from changing the default port the mail is being sent and received on, how does using SSL technology prevent hackers who stumble upon the mail server from &quot;relaying&quot; mail through the server if theyre able to correctly guess username and password for an account? My assumption is it doesnt. <br />
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Aside from encrypting the text so it cant be read as it passes through the Internet, what benefit does SSL provide? <br />
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The mail server software allegedly supports Activesync, but I cant make it work with any of our phones (Iphones and Androids only). How is activesync different from just allowing POP3/SMTP to the phone client? <br />
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Lastly, assuming the default ports for POP3 and SMTP (995 and 465) are used, what other ports would need to &nbsp;be opened on the firewall for an SSL solution to work? for an ActiveSync solution to work? Does anyone have a good guide to either?
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I have a customer who wants to be able to send and receive email THROUGH their firewall to their mail server (Imail 11).  

Aside from changing the default port the mail is being sent and received on, how does using SSL technology prevent hackers who stumble upon the mail server from "relaying" mail through the server if theyre able to correctly guess username and password for an account? My assumption is it doesnt. 

Aside from encrypting the text so it cant be read as it passes through the Internet, what benefit does SSL provide? 

The mail server software allegedly supports Activesync, but I cant make it work with any of our phones (Iphones and Androids only). How is activesync different from just allowing POP3/SMTP to the phone client? 

Lastly, assuming the default ports for POP3 and SMTP (995 and 465) are used, what other ports would need to  be opened on the firewall for an SSL solution to work? for an ActiveSync solution to work? Does anyone have a good guide to either?

Several related questions to phone to server mail sending security and syncronization

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

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

HTTPS is a protocol for secure communication over a computer network which is widely used on the Internet. HTTPS consists of communication over Hypertext Transfer Protocol (HTTP) within a connection encrypted by Transport Layer Security (TLS) or its predecessor, Secure Sockets Layer (SSL). The main motivation for HTTPS is authentication of the visited website and to protect the privacy and integrity of the exchanged data. HTTPS is widely used for protecting page authenticity on all types of websites, securing accounts and keeping user communications, identity and web browsing private.