Не приходят письма через sendmail

[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = localhost
; http://php.net/smtp-port
smtp_port = 25
 
; For Win32 only.
; http://php.net/sendmail-from
sendmail_from = me@example.com
 
; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
sendmail_path = /usr/sbin/sendmail -t -i
 
; Force the addition of the specified parameters to be passed as extra parameters
; to the sendmail binary. These parameters will always replace the value of
; the 5th parameter to mail(), even in safe mode.
;mail.force_extra_parameters =
 
; Add X-PHP-Originating-Script: that will include uid of the script followed by the filename
mail.add_x_header = On
 
; The path to a log file that will log all mail() calls. Log entries include
; the full path of the script, line number, To address and headers.
;mail.log =

Feb 23 16:09:31 podboravto sendmail[7510]: w1ND91Gd007510: to=myemail@gmail.com, ctladdr=webmaster@site.ru (503/504), delay=00:00:30, xdelay=00:00:30, mailer=relay, pri=30094, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with [127.0.0.1]

# ls -la `which sendmail`                                                                       
lrwxrwxrwx 1 root root 21 Feb 22 17:29 /usr/sbin/sendmail -> /etc/alternatives/mta

$from = "info@сайт.ru";
    $title = 'Заявка ' . $host;
    $text = "<b>Имя:</b><br />";
    $text.= "<b>Телефон:</b> <br />";
   
    $boundary = "--".md5(uniqid(time())); 
    $headers = "MIME-Version: 1.0;\r\n"; 
    $headers .="Content-Type: multipart/mixed; boundary=\"$boundary\"\r\n"; 
    $headers .= "From: info@сайт.ru ";
    $headers .= "Reply-To: " . $from . "\r\n";
    $headers .= "Content-type: text/html; charset=\"utf-8\";" . "\r\n";
    mail($notification_email, $title, $text, $headers);

# telnet smtp.yandex.ru 25                                                                      
Trying 77.88.21.38...                                                                                              
telnet: connect to address 77.88.21.38: Connection timed out                                                       
Trying 213.180.204.38...                                                                                           
telnet: connect to address 213.180.204.38: Connection timed out                                                    
Trying 93.158.134.38...                                                                                            
telnet: connect to address 93.158.134.38: Connection timed out                                                     
Trying 87.250.250.38...                                                                                            
telnet: connect to address 87.250.250.38: Connection timed out                                                     
Trying 213.180.193.38...                                                                                           
telnet: connect to address 213.180.193.38: Connection timed out                                                    
Trying 2a02:6b8::38...                                                                                             
telnet: connect to address 2a02:6b8::38: Connection timed out

[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = localhost
; http://php.net/smtp-port
smtp_port = 25
 
; For Win32 only.
; http://php.net/sendmail-from
sendmail_from = me@example.com
 
; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
sendmail_path = /usr/sbin/sendmail -t -i
 
; Force the addition of the specified parameters to be passed as extra parameters
; to the sendmail binary. These parameters will always replace the value of
; the 5th parameter to mail(), even in safe mode.
;mail.force_extra_parameters =
 
; Add X-PHP-Originating-Script: that will include uid of the script followed by the filename
mail.add_x_header = On
 
; The path to a log file that will log all mail() calls. Log entries include
; the full path of the script, line number, To address and headers.
;mail.log =

[mail function]
; For Win32 only.
; http://php.net/smtp
;SMTP = localhost
SMTP = ssl://smtp.yandex.ru/
; http://php.net/smtp-port
smtp_port = 465
 
; For Win32 only.
; http://php.net/sendmail-from
sendmail_from = mymail@yandex.ru
 
; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
sendmail_path = /usr/sbin/sendmail -t -i
 
; Force the addition of the specified parameters to be passed as extra parameters
; to the sendmail binary. These parameters will always replace the value of
; the 5th parameter to mail(), even in safe mode.
;mail.force_extra_parameters =
 
; Add X-PHP-Originating-Script: that will include uid of the script followed by the filename
mail.add_x_header = On
 
; The path to a log file that will log all mail() calls. Log entries include
; the full path of the script, line number, To address and headers.
;mail.log = /var/log/mail.log

Mar  1 17:29:47 nameserver postfix/pickup[2573]: 79B483F20489: uid=503 from=<webmaster@site.ru>
Mar  1 17:29:47 nameserver postfix/cleanup[3075]: 79B483F20489: message-id=<20180301142947.79B483F20489@nameserver.org>
Mar  1 17:29:47 nameserver postfix/qmgr[2574]: 79B483F20489: from=<webmaster@site.ru>, size=339, nrcpt=1 (queue active)
Mar  1 17:29:49 nameserver postfix/smtp[3077]: connect to mx.yandex.ru[213.180.193.89]:25: Connection timed out
Mar  1 17:29:50 nameserver postfix/smtp[3061]: connect to mx.yandex.ru[77.88.21.89]:25: Connection timed out
Mar  1 17:29:50 nameserver postfix/smtp[3061]: 2DBFA3F20477: to=<mymail@ya.ru>, relay=none, delay=59330, delays=59255/0.03/75/0, dsn=4.4.1, status=deferred (connect to mx.yandex.ru[77.88.21.89]:25: Connection timed out)
Mar  1 17:29:50 nameserver postfix/smtp[3062]: connect to mx.yandex.ru[213.180.193.89]:25: Connection timed out