Re: [exim] smarthost Outsmarting me so Far

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Autor: Bill Cole
Data:  
A: Martin McCormick via Exim-users
Assumpte: Re: [exim] smarthost Outsmarting me so Far
On 2022-05-10 at 09:34:14 UTC-0400 (Tue, 10 May 2022 08:34:14 -0500)
Martin McCormick via Exim-users <martin.m@???>
is rumored to have said:

[...]
>     I also tried
>    openssl s_client -connect smtp.suddenlink.net:465 -starttls=smtp

>
>     That gets you:

>
> Didn't find STARTTLS in server response, trying anyway...


Well, yes: on port 465 you do not use '-starttls=smtp' because port 465
is 'implicit TLS' or 'wrapper-mode TLS' and starts the handshake at
connect, like HTTPS on port 443. You CAN use '-starttls=smtp' on port 25
or 587.



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Bill Cole
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