Standard encryption services enhance the security of data exchange between the mobile device and the server. You can configure Exchange ActiveSync to use SSL encryption when transferring data between the Exchange server and the client mobile device.

Exchange ActiveSync has the following features:

• HTML messaging support;
• Execution mark support;
• Grouping e-mail messages by conversation
• the ability to synchronize or not synchronize an entire conversation;
• synchronization of SMS with the user’s Exchange mailbox;
• support for viewing message reply status
• support for quick message retrieval;
• meeting attendee information;
• Enhanced Exchange search
• PIN reset
• enhanced device security using password policies;
• autodiscovery for service over a wireless network;
• Support for setting auto-replies in case of user absence, vacation or business trip
• Support task synchronization
• Direct Push.
• Support for availability information for contacts;

Exchange ActiveSync protocol management

The Exchange ActiveSync protocol is enabled by default. All users who have an Exchange mailbox can synchronize their mobile device with the Microsoft Exchange server.

The following Exchange ActiveSync tasks can be performed:

• enabling and disabling Exchange ActiveSync for users;
• setting policies such as minimum password length, device lockout, and maximum number of incorrect password attempts;
• Run remote wipe to wipe all data from a lost or stolen cell phone;
• Running various reports to view or export in different formats
• Control which types of mobile devices can sync with the organization through device access rules

Control mobile device access in Exchange ActiveSync
You can control which mobile devices can synchronize with Exchange Server. This is done by tracking new mobile devices that connect to the organization or by configuring rules that define the allowed types of mobile devices. Regardless of the method you choose, you can allow or deny access for all specified mobile devices of a particular user at any time.

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The term is often confused with IMAP and POP. But SMTP is a protocol for sending mail, when IMAP and POP ー handling the internals after receiving the mail.
So it is not for decryption, SMTP Server is designed for transmission only, mainly for bulk campaign.

What it is for and what types exist

SMTP server is a kind of mailman. Its task is to take the “parcel” from one user, find the optimal and accurate path of transportation and give it to another user.

Conditionally divided into:

Ordinary.
For personal correspondence. More often they belong to providers of web-hosting, internet networks, etc. But the peculiarity is that the amount of mailings is limited, usually for a day.

Special repeaters.
This is a server for mass and transactional email campaign. The limit ends at millions. You can not be afraid that the IP will be blocked.

They are also classified depending on the source:

From ISPs.
Does not require separate skills, but there is a limit on the number and speed of sending. The amount depends on the selected tariff.

From free email services.
Yandex, Gmail, Yahoo allow you to send out on relays. You need to authorize under a personal account, specify the port and encryption. Suitable for use from a mobile device. But the limit in the section from 150 to 500 emails per day.

From hosting providers.
If you have a site, you can use Simple Mail Transfer Protocol hosting. But with spamming from hundreds of sites with one IP, it will be blocked by mail services. To avoid blocking, better rent a virtual SMTP.

From email services
The number is limited by desire. How many you need, so much and buy. You can send from the site, CRM or application, after registering an account.

Advantages:

High deliverability
To reduce spam, email clients restrict or block email inboxes altogether. With SMTP, the likelihood of blocking is close to zero, due to user authorization. Since, the login and password on a particular service are taken into account while logging into the account, and mailers have fewer questions for real people.

Secure interaction
What is an SMTP server? It is only a delivery person, it does not look inside the mail and does not save personal data. Information about the client base is stored only with you.

Millions of emails in minutes
Quickly exchange and follow up information in your personal account or PC app.

Does not require installation of special software
It is enough to understand the principle of operation and apply a simple set of commands. No additional installation is required.

Reporting on deliverability and sending errors
In case of failure to send information even after several attempts, the owner automatically receives a failure message.

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POP3 client programs download messages to a single folder on the client computer (usually the Inbox folder). With the POP3 protocol, you cannot synchronize multiple folders on a mail server with multiple folders on a client computer. The POP3 protocol also does not support access to shared folders.

IMAP4 clients are much more flexible and usually offer more features than POP3 clients. By default, IMAP4 clients do not delete downloaded messages from the mail server. This behavior makes it easy to access e-mail messages from multiple computers.

IMAP4 clients support creating and accessing multiple e-mail folders on the e-mail server. For example, most IMAP4 clients can be configured to store a copy of sent items on the server so that these messages can be accessed from any computer.

IMAP4 supports additional features supported by most IMAP4 clients (for example, viewing message senders and subjects before downloading the entire message).

Sending and receiving options for POP3 and IMAP4 e-mail programs

POP3 and IMAP4 clients allow users to choose when they want to connect to a mail server to send and receive e-mail. This section discusses some of the more common connection options and provides some factors that users should consider when selecting the connection options available in their POP3 and IMAP4 e-mail clients.

Common configuration options

In most client programs that support the POP3 and IMAP4 protocols, you can set three such parameters:

Send and receive mail each time the e-mail program is started. If this setting is used, messages are sent and received only when the e-mail program is started.

Receive and send mail manually. If this option is used, mail is sent and received when you click the Send and Receive button in the client user interface.

Send and receive mail at a specified interval. If this option is used, the client program connects to the server at a specified interval to send messages and download new messages.

For more information about configuring these settings in the email program you are using, see the help documentation for that program.

Guidelines for selecting send and receive settings
By default, some e-mail programs do not save copies of messages on the server after delivery. If a user needs to view their messages using different programs or devices, it is recommended that a copy of the messages be saved on the server.

For clients with a persistent connection, the user can configure the email application to send and receive messages every specified minutes. Connecting to the email server at frequent intervals allows the user to keep the email application up to date with the most current information on the server.

However, if the client is not always connected to the Internet, the user can configure the e-mail application to send and receive messages manually.

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