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.

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.