Problem sending emails - Joomla! Forum - community, help and support

hi,
i'm turning crazy problem.
only on couple of domain (on different machines) after regular installation email send joomla! doesn't work.

i've tested mail() funcion putting php file in root , mail regularely arrives.
this code i've tested:

code: select all

$destinatario = "destinatario@esempio.it";
$soggetto = "test";
$messaggio = "ciao, questa è una mail di test.";
$headers = "from: mittente@esempio.it";
mail($destinatario, $soggetto, $messaggio, $headers);

inside joomla! i've tried setting phpmail, sendmail, smtp (localhost , external). no luck. or without auth, or without crictography. using external email or email of same domain. (the mail() function sends no problem email different domain.

those configuration i've used:

can help?!

thanks in advance.
cesare

--------------
config 1
mailer: smtp
mail from: same domain email
auth smtp no
security smtp none
port smtp 25
username smtp: smtp user
password smtp: smtp pwd
smtp: localhost or smtp.domainname.it

error: following address failed: email@domainname.it

--------------
config 2
mailer: php mail
mail from: same domain email
auth smtp no
security smtp none
port smtp 25
username smtp: smtp user
password smtp: smtp pwd
smtp: localhost

error: not instantiate mail function.

--------------
config 3
mailer: sendmail
mail from: same domain email
auth smtp no
security smtp none
port smtp 25
username smtp: smtp user
password smtp: smtp pwd
smtp: localhost

error: not execute: /usr/sbin/sendmail

here's workaround.
at momento i've choosed workaround.
but problem must regarding other functions.

the problem introduced version 2.5.5 , above.
probably, think, have installed version 2.5.4 or less , have upgraded, don't have same problem (strange...) while have installed 2.5.5 or later have issue.

i've bounch of websites keep working if upgraded 2.5.7. new installation have issue.

this record.
cesare