<s>
PHPMailer	B-Language
is	O
a	O
code	O
library	O
to	O
send	O
(	O
transport	O
)	O
emails	O
safely	O
and	O
easily	O
via	O
PHP	B-Application
code	O
from	O
a	O
web	O
server	O
(	O
MUA	O
to	O
the	O
MSA	B-Protocol
server	O
)	O
.	O
</s>
<s>
Sending	O
emails	O
directly	O
by	O
PHP	B-Application
code	O
requires	O
a	O
high-level	O
familiarity	O
to	O
SMTP	B-Protocol
protocol	I-Protocol
standards	O
(	O
)	O
and	O
related	O
issues	O
(	O
such	O
as	O
Carriage	O
return	O
)	O
and	O
vulnerabilities	O
about	O
Email	B-Protocol
injection	I-Protocol
for	O
spamming	O
.	O
</s>
<s>
From	O
2001	O
PHPMailer	B-Language
is	O
one	O
of	O
the	O
popular	O
solutions	O
for	O
these	O
matters	O
on	O
PHP	B-Application
.	O
</s>
<s>
PHPMailer	B-Language
was	O
originally	O
written	O
in	O
2001	O
by	O
Brent	O
R	O
.	O
Matzelle	O
as	O
a	O
SourceForge	O
project	O
.	O
</s>
<s>
Marcus	O
created	O
his	O
fork	O
on	O
GitHub	B-Application
.	O
</s>
<s>
Jim	O
and	O
Marcus	O
decide	O
to	O
join	O
forces	O
and	O
use	O
GitHub	B-Application
as	O
the	O
canonical	O
and	O
official	O
repo	O
for	O
PHPMailer	B-Language
.	O
</s>
<s>
PHPMailer	B-Language
moved	O
to	O
the	O
PHPMailer	B-Language
organization	O
on	O
GitHub	B-Application
.	O
</s>
<s>
Worx	O
International	O
Inc	O
claimed	O
in	O
2009	O
that	O
:	O
"	O
PHPMailer	B-Language
continues	O
to	O
be	O
the	O
world	O
's	O
most	O
popular	O
transport	O
class	O
,	O
with	O
an	O
estimated	O
9	O
million	O
[ ⁠message	O
user	O
agents⁠ ]	O
worldwide	O
.	O
</s>
<s>
PHPMailer	B-Language
sends	O
an	O
SMTP	B-Protocol
extension	O
command	O
with	O
the	O
sent	O
emails	O
as	O
below	O
which	O
can	O
be	O
used	O
to	O
get	O
the	O
usage	O
report	O
of	O
PHPMailer	B-Language
on	O
the	O
ESPs	O
(	O
Email	O
Service	O
Providers	O
)	O
:	O
</s>
<s>
This	O
SMTP	B-Protocol
header	O
may	O
differ	O
for	O
different	O
versions	O
of	O
PHPMailer	B-Language
,	O
and	O
can	O
also	O
be	O
suppressed	O
or	O
modified	O
by	O
PHP	B-Application
code	O
.	O
</s>
<s>
It	O
also	O
comes	O
with	O
Integrated	O
SMTP	B-Protocol
support	O
which	O
means	O
you	O
can	O
send	O
emails	O
without	O
a	O
local	O
mail	O
server	O
.	O
</s>
