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Subject: Re: Mail Server Inquiry
From: Robert Munyer <[log in to unmask]>
Reply-To:Platform Independent Linux List! <[log in to unmask]>
Date:Sat, 3 Mar 2018 06:54:43 -0500

text/plain (28 lines)

>> AUTH on port 25 is on your list of expected features?
> My goal while sysadmin in the university department was that Thunderbird
> at home on Cox cable worked without logging into the university VPN.

If you try that in 2018, I'd expect your residential ISP to block your
SYN packets.  I think of AUTH as something that you normally offer (and
require) on 587, which you may or may not have open to the outside world.

> Was that particular exposure unnecessary?

No, if you had 587 open to the world, I don't think offering AUTH
on 25 would incur any additional risk for you.  I don't have 587
open, so for me AUTH on 25 might incur some small additional risk.

> Content-Disposition: inline; filename=mailtesting-probe.log

Thanks.  Nothing obvious jumps out at me, but here are 3 things I
don't understand: (1) HTTP activity starts several minutes before
message timestamp; (2) When the user agent mentions Googlebot, some
text that seems to belong in the referrer field is inside the user
agent field; (3) Two of the three Googlebot entries are from Google
IP space, but the other one seems to be from Amazon EC2 IP space.

I don't normally look at web server logs; these things might be
obvious to someone who does.

-- Robert

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