У меня одного сабж не работает?
делаю telnet smtp.mail.ru 587 и молчок.
dikiy@rosh:~$ telnet smtp.mail.ru 587
Trying 2a00:1148:db00::8...
^C
dikiy@rosh:~$
более того, почему одно имя резольвится в IPv4, а другое в IPv6?
dikiy@rosh:~$ telnet smtp.mail.ru 587
Trying 2a00:1148:db00::8...
^C
dikiy@rosh:~$ telnet imap.mail.ru imap
Trying 94.100.180.90...
Connected to imap.MAIL.ru.
Escape character is '^]'.
* OK Welcome
a1 LOGIN aa aa
a1 NO [PRIVACYREQUIRED] Command disabled. Please use STARTTLS first.
a1 LOGOUT
* BYE logging out
a1 OK LOGOUT completed
Connection closed by foreign host.
dikiy@rosh:~$
dikiy@rosh:~$ telnet 217.69.139.160 587
Trying 217.69.139.160...
Connected to 217.69.139.160.
Escape character is '^]'.
220 smtp36.i.mail.ru ESMTP ready (Looking for Mail for your domain? Visit https://biz.mail.ru)
QUIT
221 2.0.0 Bye
Connection closed by foreign host.