Issues Affecting Small Email-servers
In recent years, mainly due to concerns over spam and a general trend towards centralisation, problems have arisen for small organisations and home users wishing to run their own email server. As of 2011 many ISPs pre-emptively block outgoing connections to TCP port 25 on domestic connections, and larger email providers have increasingly stringent requirements for other servers that wish to transfer emails to them. For example: reverse PTR records of the sending mail server are often checked before accepting mail. The PTR record must be set up by the ISP, which may refuse this request to a small-business or domestic user.
Other problems encountered by small mail-servers include zealous use of blacklisting and a presumption of guilt by blacklisting services and large email providers, which classify "new" servers as spammers by default. Such measures have inevitably reduced the overall number of small email-servers, and some end-users have opted to outsource to paid services instead, exacerbating the problem for those not wishing to outsource.
Read more about this topic: Message Transfer Agent
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