Hi all,
So for the last few weeks I've had some problems with my internet, and
since I host my mail server, I have missed some mail.
Since I'm somewhat of a night-owl, I've decided to setup a `postfix`
server on a remote VM that is configured to recieve any mail sent while
my primary mailserver is "offline".
My query is: Is there a good way for me to test this is working for
external mail and secure without actually taking my primary mailserver
offline?
Thusfar, I've tested with basic SMTP HELO with the following:
```
[root@gltx-rmac-01 ~]# telnet 141.95.90.9 25
Trying 141.95.90.9...
Connected to 141.95.90.9.
Escape character is '^]'.
220 GLTX-SMTP-01.galactix.xyz ESMTP Postfix
HELO example.com
250 GLTX-SMTP-01.galactix.xyz
mail from: t...@example.com
250 2.1.0 Ok
rcpt to: rh...@galactix.xyz
data250 2.1.5 Ok
354 End data with <CR><LF>.<CR><LF>
Subject: This is a test email.
This is a test email, please ignore.
.
250 2.0.0 Ok: queued as A1CC752D1
```
And I do recieve the emails when sent directly this way, but I just want
to verify it's all working correctly for external mail.
Let me know :)
Thanks,
Rhys.
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