No Emails sent

Hi…
I need your help… The form says “email sent” but no emails arrived… Nothing in spam folder… And I’ve seen al your documentation about this problem.

I’ll get this error on the same page of contact form:

PHPMailer Debug

PHPMailer Object
(
[Version] => 5.2.14
[Priority] =>
[CharSet] => UTF-8
[ContentType] => text/plain
[Encoding] => 8bit
[ErrorInfo] =>
[From] => ufficiodidattico@icinzago.gov.it
[FromName] => ciro
[Sender] => ufficiodidattico@icinzago.gov.it
[ReturnPath] =>
[Subject] => IC INZAGO Modulo Contatto Pubblico:cirowebup2.0@gmail.com prova
[Body] => A:
Al Webmaster

Nome:
ciro

Email:
webup2.0@gmail.com

Oggetto:
prova

Messaggio:
provaaaaaaaaaaaaa

Allegati:
No file attached

Inviato da (indirizzo IP): 79.54.201.188
(host188-201-dynamic.54-79-r.retail.telecomitalia.it)
Data/ora: 13 gennaio 2016 01:30
In arrivo da (referente): http://www.icinzago.gov.it/contatti/
User agent (in uso): Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0;
rv:11.0) like Gecko

[AltBody] =>
[Ical] =>
[MIMEBody:protected] =>
[MIMEHeader:protected] =>
[mailHeader:protected] =>
[WordWrap] => 0
[Mailer] => mail
[Sendmail] => /usr/sbin/sendmail
[UseSendmailOptions] => 1
[PluginDir] =>
[ConfirmReadingTo] =>
[Hostname] =>
[MessageID] =>
[MessageDate] =>
[Host] => localhost
[Port] => 25
[Helo] =>
[SMTPSecure] =>
[SMTPAutoTLS] => 1
[SMTPAuth] =>
[SMTPOptions] => Array
(
)

[Username] =>
[Password] =>
[AuthType] =>
[Realm] =>
[Workstation] =>
[Timeout] => 300
[SMTPDebug] => 0
[Debugoutput] => echo
[SMTPKeepAlive] =>
[SingleTo] =>
[SingleToArray] => Array
(
)

[do_verp] =>
[AllowEmpty] =>
[LE] =>

[DKIM_selector] =>
[DKIM_identity] =>
[DKIM_passphrase] =>
[DKIM_domain] =>
[DKIM_private] =>
[action_function] =>
[XMailer] =>
[smtp:protected] =>
[to:protected] => Array
(
[0] => Array
(
[0] => cirocelentano@gmail.com
[1] =>
)

)

[cc:protected] => Array
(
)

[bcc:protected] => Array
(
)

[ReplyTo:protected] => Array
(
)

[all_recipients:protected] => Array
(
[cirocelentano@gmail.com] => 1
)

[RecipientsQueue:protected] => Array
(
)

[ReplyToQueue:protected] => Array
(
)

[attachment:protected] => Array
(
)

[CustomHeader:protected] => Array
(
[0] => Array
(
[0] => Reply-To
[1] => webup2.0@gmail.com
)

[1] => Array
(
[0] => X-Sender
[1] => ufficiodidattico@icinzago.gov.it
)

[2] => Array
(
[0] => Return-Path
[1] => ufficiodidattico@icinzago.gov.it
)

)

[lastMessageID:protected] =>
[message_type:protected] =>
[boundary:protected] => Array
(
)

[language:protected] => Array
(
)

[error_count:protected] => 0
[sign_cert_file:protected] =>
[sign_key_file:protected] =>
[sign_extracerts_file:protected] =>
[sign_key_pass:protected] =>
[exceptions:protected] => 1
[uniqueid:protected] =>
)

Mail sending aborted.

Can you help me?

https://wordpress.org/plugins/si-contact-form/