Need some clarification on Mail Settings. We are managing around hundreds of applications. These applications runs on Linux based hosts and used to send mails to users based on user registration at site and other actions.
Sendmail configured on these Linux servers to relay mails to destination mailbox. The following setting is being used in
sendmail.cf to forward mails to relay mail server.
This is fine for me. But on some servers , I can see only
sendmail is running but the above settings is not enabled. But still mails are going through this server.
I tried to send mails to Yahoo and GMAIL accounts and mails are successfully getting delivered.
Aug 31 03:36:12 vmprod sendmail: u7V7aCMr023396: from=<email@example.com>, size=534, class=0, nrcpts=1, msgid=<201608310736.u7V7aCee023393@vmprod.wiley.com>, proto=ESMTP, daemon=MTA, *relay=localhost [127.0.0.1]* Aug 31 03:36:12 vmprod sendmail: u7V7aCee023393: firstname.lastname@example.org, ctladdr=admin (35014/10), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30220, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (u7V7aCMr023396 Message accepted for delivery) Aug 31 03:36:13 vmprod sendmail: STARTTLS=client, relay=mx-apac.mail.gm0.yahoodns.net., version=TLSv1/SSLv3, verify=FAIL, cipher=RC4-SHA, bits=128/128 Aug 31 03:36:16 vmprod sendmail: u7V7aCMr023396: to=<email@example.com>, ctladdr=<firstname.lastname@example.org> (35014/10), delay=00:00:04, xdelay=00:00:04, mailer=esmtp, pri=120534, *relay=mx-apac.mail.gm0.yahoodns.net*. [188.8.131.52], dsn=2.0.0, stat=Sent (ok dirdel)
Postfix,Exim running on this host
-bash-4.1$ ps -ef | grep postifx essadmin 8974 20942 0 06:20 pts/4 00:00:00 grep postifx -bash-4.1$ ps -ef | grep exim essadmin 8982 20942 0 06:20 pts/4 00:00:00 grep exim
/etc/resolv.conf is pointing to a valid DNS server .
$ cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.3 (Santiago)
I am confused how mails are getting delivered since
SMARTHOST is not configured . Any pointers ?