Several MTAs are available for Ubuntu, each with its pros and cons. Normally they are hidden under the skin of Ubuntu, silently moving mail between servers all over the world with need for little or no maintenance. Some MTAs are extremely powerful, being able to cope with hundreds of thousands of messages each day, whereas some are more geared toward smaller installations. Other MTAs are perhaps not as powerful, but are packed full with features. In the next section, we take a look at some of the more popular MTAs available for Ubuntu.
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