<Li> Bob may pick up his email in many ways, for example logging into mx.b.org and reading it directly, or by using a webmail service . </Li> <Li> Domains usually have several mail exchange servers so that they can continue to accept mail even if the primary is not available . </Li> <P> Many MTAs used to accept messages for any recipient on the Internet and do their best to deliver them . Such MTAs are called open mail relays . This was very important in the early days of the Internet when network connections were unreliable . However, this mechanism proved to be exploitable by originators of unsolicited bulk email and as a consequence open mail relays have become rare, and many MTAs do not accept messages from open mail relays . </P> <P> The Internet email message format is now defined by RFC 5322, with encoding of non-ASCII data and multimedia content attachments being defined in RFC 2045 through RFC 2049, collectively called Multipurpose Internet Mail Extensions or MIME . RFC 5322 replaced the earlier RFC 2822 in 2008, and in turn RFC 2822 in 2001 replaced RFC 822--which had been the standard for Internet email for nearly 20 years . Published in 1982, RFC 822 was based on the earlier RFC 733 for the ARPANET . </P>

Email asynchronous nature has which of the following benefits