[CentOS] [MASSMAIL] Dovecot on C7.2 - secure internet access

Thu May 5 14:18:56 UTC 2016
Gary Stainburn <gary at ringways.co.uk>

I've tried the changes that I put below. Users are still able to log in from 
the LAN.

However, despite putting the appropriate rule in my firewall allowing port 143  
I cannot create a user on a PC outside my network.

I'm using Thunderbird to do the testing.  Is there a better way to test my 
setup?  Thunderbird doesn't give any diagnostic data, it just says it's 
failed to test the account.

On Thursday 05 May 2016 11:03:34 Gary Stainburn wrote:
> I have a mail server running on Centos 7.2 which has been working for my
> LAN for a long time.
> I'm at the point where I have to make it accessible to the internet.  At
> the moment, access can be insecure but as it's on my LAN it isn't an issue.
> However, for internet access I wish to force SSL/TLS.  Having read the
> documents I think it's as simple as changing 10-ssl.conf from
> ssl = yes
> to
> ssl = required
> remote {
>   ssl = yes
> }
> Am I right in thinking that this would make the global value now force
> SSL/TLS to be required, but for my LAN ( override this with the
> old value of 'yes'
> Is there a better way to do this?
> Have I missed anything?
> I believe that this means implies
> disable_plaintext_auth = no
> for all except my LAN. Is that right?
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Gary Stainburn
Group I.T. Manager
Ringways Garages