bash-4.4#  postqueue -p
-Queue ID-  --Size-- ----Arrival Time---- -Sender/Recipient-------
335C410B       8135 Tue Mar 13 16:01:17  kqueen@mirantis.com
             (connect to mx.yandex.ru[93.158.134.89]:25: Connection timed out)
                                         katyafervent@yandex.ru

9EEC3104       8135 Tue Mar 13 15:57:19  kqueen@mirantis.com
             (connect to mx.yandex.ru[87.250.250.89]:25: Connection timed out)
                                         katyafervent@yandex.ru

2BA6510C       8135 Tue Mar 13 16:02:01  kqueen@mirantis.com
             (connect to mx.yandex.ru[87.250.250.89]:25: Connection timed out)
                                         katyafervent@yandex.ru

5435C10A       8135 Tue Mar 13 16:01:05  kqueen@mirantis.com
            (connect to mx.yandex.ru[213.180.204.89]:25: Connection timed out)
                                         katyafervent@yandex.ru

-- 31 Kbytes in 4 Requests.
bash-4.4# ping mx.yandex.ru
PING mx.yandex.ru (213.180.204.89) 56(84) bytes of data.
64 bytes from mx.yandex.ru (213.180.204.89): icmp_seq=1 ttl=53 time=11.3 ms
64 bytes from mx.yandex.ru (213.180.204.89): icmp_seq=2 ttl=53 time=2.84 ms
^C