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Full Discussion: Sendmail Fails to send emails from Linux server.
Top Forums Shell Programming and Scripting Sendmail Fails to send emails from Linux server. Post 303002564 by mohtashims on Sunday 27th of August 2017 06:11:19 PM
Old 08-27-2017
Hammer & Screwdriver Sendmail Fails to send emails from Linux server.
I m using free zoho mail client application (similar to microsoft outlook) on my mobile [android / ios] for all my emails to mohtashim@techx.com

I wish to only recieve emails from my Linux Server details of which are: techx 3.10.0-514.10.2.el7.x86_64 #1 SMP CentOS release 7.3.1611 (Core).

I try the below command to shoot an email from the Linux server to my zoho mail client's mohtashim@techx.com email id but the email does not show in my inbox.
Code:
[mohtashim@techx ~]$ echo "hello" | mail mohtashim@techx.com
You have new mail in /var/spool/mail/mohtashim

As soon as i fire this email command, the logs tail -f /var/log/maillog shows the following msg:

Quote:
Aug 27 22:03:12 techx sendmail[3012]: v7RM3C9k003012: from=mohtashim, size=201, class=0, nrcpts=1, msgid=<201708272203.v7RM3C9k003012@techx.com>, relay=mohtashim@localhost
Aug 27 22:03:12 techx sendmail[3013]: v7RM3Cmr003013: from=<mohtashim@techx.com>, size=439, class=0, nrcpts=1, msgid=<201708272203.v7RM3C9k003012@techx.com>, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]
Aug 27 22:03:12 techx sendmail[3012]: v7RM3C9k003012: to=mohtashim@techx.com, ctladdr=mohtashim (1010/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30201, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (v7RM3Cmr003013 Message accepted for delivery)
Aug 27 22:03:12 techx sendmail[3014]: v7RM3Cmr003013: to=<mohtashim@techx.com>, ctladdr=<mohtashim@techx.com> (1010/0), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30621, dsn=2.0.0, stat=Sent
When i try mail command i do see the mail for mohtashim user on the Linux server as shown below:

Code:
[mohtashim@techx ~]$ mail
 N 39 mohtashim@techx.c  Sun Aug 27 21:34  19/710
& 39
Message 39:
From mohtashim@techx.com  Sun Aug 27 21:34:12 2017
Return-Path: <mohtashim@techx.com>
From: mohtashim@techx.com
Date: Sun, 27 Aug 2017 21:34:12 +0000
To: mohtashim@techx.com
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
Status: R

hello

I m using smtp.zoho.com to send out emails from the Linux box.

Below are a few important settings from /etc/mail/sendmail.mc

Code:
define(`SMART_HOST', `smtp.zoho.com')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA')dnl
DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl
DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl
define(`RELAY_MAILER_ARGS', `TCP $h 587')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h 465')dnl

Here are the firewall ports i have opened
Code:
[root@techx ~]# netstat -ntlp | grep sendmail
tcp        0      0 0.0.0.0:465             0.0.0.0:*               LISTEN      1733/sendmail: acce
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      1733/sendmail: acce
tcp        0      0 0.0.0.0:587             0.0.0.0:*               LISTEN      1733/sendmail: acce

telnet smtp.zoho.com <port_number> connects on port 587 and 465 only but does not connect on port 25.

I don't know why i don't receive the mail in my zoho application ?

Can you please help so that i can see the emails from my Linux server to my mobile zoho app ?
Last edited by mohtashims; 08-28-2017 at 05:22 AM.. Reason: Formatting for better readability.
 

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