Testing if Postfix MTA on Centos 8 is working on localhost

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[root@thermalite siteconfig]# telnet localhost 25 Trying ::1... Connected to localhost. Escape character is '^]'. 220 thermalite.localdomain ESMTP Postfix ehlo thermalite.localdomain 250-thermalite.localdomain 250-PIPELINING 250-SIZE 1024000000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250 SMTPUTF8 MAIL FROM: bills@thermalite.localdomain 250 2.1.0 Ok RCPT TO: o2bot@thermalite.localdomain 250 2.1.5 Ok DATA 354 End data with <CR><LF>.<CR><LF> Subject: Hello postfix This is a test email using postfix MTA . 250 2.0.0 Ok: queued as 47A074112F1B quit 221 2.0.0 Bye Connection closed by foreign host. [root@thermalite siteconfig]# ls -l /var/mail/ bills malex o2bot root rpc [root@thermalite siteconfig]# ls -l /var/mail/o2bot -rw-rw----. 1 o2bot mail 600 Aug 12 17:03 /var/mail/o2bot [root@thermalite siteconfig]# cat /var/mail/o2bot From bills@thermalite.localdomain Wed Aug 12 17:03:39 2020 Return-Path: <bills@thermalite.localdomain> X-Original-To: o2bot@thermalite.localdomain Delivered-To: o2bot@thermalite.localdomain Received: from thermalite.localdomain (thermalite [IPv6:::1]) by thermalite.localdomain (Postfix) with ESMTP id 47A074112F1B for <o2bot@thermalite.localdomain>; Wed, 12 Aug 2020 17:01:56 -0400 (EDT) Subject: Hello postfix Message-Id: <20200812210233.47A074112F1B@thermalite.localdomain> Date: Wed, 12 Aug 2020 17:01:56 -0400 (EDT) From: bills@thermalite.localdomain This is a test email using postfix MTA [root@thermalite siteconfig]#