[tech] [wheel] Email security appliance migration for ucc.asn.au and ucc.guild.uwa.edu.au

[James Andrewartha]

On Wed, 4 Dec 2019, Nick Bannon wrote:

> It occurs to me - why the strict change window? Couldn't we start
> using the new MX'es pretty much immediately?
> 
> Testing reveals... No. Connecting to them on port 25 currently
> results in no response - one might expect an ESMTP banner.
> (a la "telnet mooneye 25")

Don't forget UWA blocks tcp/25 to the outside world. From my work I get a 
banner:

$ telnet 139.138.42.213 25
Trying 139.138.42.213...
Connected to 139.138.42.213.
Escape character is '^]'.
220 esa2.hc253-53.ap.iphmx.com ESMTP


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