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Forcing the attempted delivery of 1 selected messages ..
Running /var/spool/mqueue/l3NIn8m4028522 (sequence 1 of 1)
<firstname.lastname@example.org>... Connecting to f.mx.mail.yahoo.com. via esmtp...
<email@example.com>... Connecting to d.mx.mail.yahoo.com. via esmtp...
<firstname.lastname@example.org>... Connecting to g.mx.mail.yahoo.com. via esmtp...
<email@example.com>... Connecting to c.mx.mail.yahoo.com. via esmtp...
<firstname.lastname@example.org>... Connecting to b.mx.mail.yahoo.com. via esmtp...
<email@example.com>... Connecting to a.mx.mail.yahoo.com. via esmtp...
<firstname.lastname@example.org>... Connecting to e.mx.mail.yahoo.com. via esmtp...
<email@example.com>... Deferred: e.mx.mail.yahoo.com.: No route to host
telnet yahoo.com 25
telnet: connect to address 22.214.171.124: No route to host
telnet: connect to address 126.96.36.199: No route to host
telnet: Unable to connect to remote host: No route to host
pls. help i used sendmail to send email, i open my mailog and it says no route to host, i don't knoe what exactly the problem
check in your mail server whether the firewall is runing and is it letting to make connections on port 25 through it. If the firewall in the server isn't configured to accept connections which are coming to port 25 you are getting the message "no route to host" on the client machine which runs the MUA.
mail.my.com domain points to your machine external IP?
if this is an induvidual server, as far as i know, "big" mail servers drop connection from unknown addresses
so then u use smart host to define your ISPs mail server and send mail through your ISPs mail server
if i try to telnet to yahoo.com 25 remote host drops the connections in an instance
and if i change my smart host or comment it out i can't send mail to some recipients either
as the "main" mail server think i'm a spammer