On Thursday, August 5, 2021, 07:57:24, Stuart Pye via TBBETA wrote:

>>8/5/2021, 01:39:25: FETCH - Certificate S/N: 6A72CB, algorithm: RSA (512 
>>bits), issued from 8/3/2021 5:34:18 AM to 7/29/2041 5:34:18 AM, for 1 
>>host(s): mx.spamdropper.com.

> I've always run Microsoft TLS crypto on TB, no issues.
> My mail server now uses Lets Encrypt for SSL certs for the various domain 
> mail it handles.
> TB connection logging showed that the LE cert changed at a certain time, from 
> a cert good for 
> six months, or 90 days, I forget which, to a cert good for 20 years. When 
> that happened, TB stopped TLS-ing
> with the M'soft default.  Switching to TB option, all is good now.
> Just thought the developers might want to know this Lets Encrypt behavior in 
> regards to TB.

The line I quoted above, and the fact that the certificate says it's valid for 
20 years means that something's intercepting your connection, and The Bat was 
right to refuse to connect (512-bit RSA hasn't been secure in the last 15 
years, and Let's Encrypt always issues certificates valid for 90 days). You 
should verify what's happening (I'm guessing some anti-spam program).

-- 
< Jernej Simončič ><><><><>< https://eternallybored.org/ >

Never buy a car that has a wick.
       -- Ford Pinto Rule

TheBat! Version 9.4.2.12 (64-bit), Windows 10.0.19043 


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