· 10 years ago · Aug 23, 2016, 07:00 AM
1> May 6 02:42:53 k***** sm-mta[15070]: q465gjxF013677:
2> to=<*****@gmail.com>, ctladdr=<*****@*****.ca> (1001/1001),
3> delay=01:00:08, xdelay=00:00:00, mailer=esmtp, pri=300329,
4> relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred:
5> Connection timed out with alt4.gmail-smtp-in.l.google.com.
6
7tcp 0 0 0.0.0.0:587 0.0.0.0:* LISTEN 15069/sendmail: MTA
8tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 15069/sendmail: MTA
9
10dig mx gmail.com
11# Look for the mail destination IP in the output - "209.85.225.27" in this case
12
13telnet 209.85.225.27 25
14# This is an attempt to telnet to port 25 (smtp) on the recipient's server...
15
16Trying 209.85.225.27...
17Connected to iy-in-f27.1e100.net (209.85.225.27).
18Escape character is '^]'.
19220 ***************************************
20
21define(`SMART_HOST', `[relay.your.isp.provides]')dnl
22
23net.ipv4.tcp_rmem = 4096 87380 174760
24net.ipv4.tcp_wmem = 4096 16384 131072
25net.ipv4.tcp_window_scaling = 0