Nagios not sending email alerts to gmail.

[kiran]

I have enabled message sending in Nagios which is working fine.
Mailing is happening to our company domain but not to gmal accounts.
I am using mailx command in commands.cfg file for sending mails.
Postfix is not needed right? When sending test mail, I am getting the following logs which read 'Service unavailable'.
Kindly help on this.

Sep 2 17:02:03 bbnlnagios sendmail[13107]: t82BW39o013107: to=[email protected], ctladdr=kiran (1032/1036), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30249, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (t82BW3F8013108 Message accepted for delivery)
Sep 2 17:02:05 bbnlnagios sm-mta[13110]: STARTTLS=client, relay=gmail-smtp-in.l.google.com., version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-RC4-SHA, bits=128/128
Sep 2 17:02:06 bbnlnagios sm-mta[13110]: t82BW3F8013108: to=<[email protected]>, ctladdr=<[email protected]> (1032/1036), delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=120495, relay=gmail-smtp-in.l.google.com. [74.125.200.26], dsn=5.0.0, stat=Service unavailable

[hsmith]

I have enabled message sending in Nagios which is working fine.
Mailing is happening to our company domain but not to gmal accounts.
I am using mailx command in commands.cfg file for sending mails.
Postfix is not needed right? When sending test mail, I am getting the following logs which read 'Service unavailable'.
Kindly help on this.

Sep 2 17:02:03 bbnlnagios sendmail[13107]: t82BW39o013107: to=[email protected], ctladdr=kiran (1032/1036), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30249, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (t82BW3F8013108 Message accepted for delivery)
Sep 2 17:02:05 bbnlnagios sm-mta[13110]: STARTTLS=client, relay=gmail-smtp-in.l.google.com., version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-RC4-SHA, bits=128/128
Sep 2 17:02:06 bbnlnagios sm-mta[13110]: t82BW3F8013108: to=<[email protected]>, ctladdr=<[email protected]> (1032/1036), delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=120495, relay=gmail-smtp-in.l.google.com. [74.125.200.26], dsn=5.0.0, stat=Service unavailable

Hi Kiran,

A lot of email providers filter out sendmail email by default, as it is a really easy method to use for spam. My recommendation is that you take a look at the following links and decide what would work best for you:

This is a possibly outdated article, but the concepts still apply.

We also have a thread here where some suggestions were given by one of our very smart former employees.

I hope this helps.