email - Why shouldn't I use PHP's mail() function?

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The general opinion when it comes to
sending email messages in PHP is to stay clear of PHP's built-in
mail() function and to use a library
instead.

What I want to know are the actual
reasons and flaws in using mail() over a library or extension.
For example, the commonly specified headers that aren't included in a standard
mail() call.

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class="normal">Answer

href="http://www.websitebaker2.org/topics/problems-sending-mails.php"
rel="noreferrer">Quoting:

Disadvantages of the PHP mail()
function

In some cases, mails send
via
PHP mail() did not receive the

recipients although it was send by WB
without any error message. The
most
common reasons for that issue are
listed
below.

• wrong format of
  mail header or content
  
  (e.g. differences in line break
  
  between Windows/Unix)


• sendmail not
  installed
  or configured on your server
  (php.ini)


• the
  mail provider of the
  recipeint does not allow mails send by
  PHP
  mail(); common spam protection

Errors in the format of header
or
content can cause that mails are
treated as SPAM. In the best
case,
such mails are transfered to the spam
folder of your
recipient inbox or send
back to the sender. In the worst case,

such mails are deleted without any
comment. If sendmail is not
installed
or not configured, no mails can be
send at
all.

It is common practice by free
mail
provider such as GMX, to reject mails
send via the PHP
function mail(). Very
often such mails are deleted
without
any information of the
recipient.