Why uw.edu not accepted my signed email?

[Claus Assmann]

On Wed, Nov 17, 2021, Andrew D. Arenson wrote:

> Oct 21 19:52:35 redsolar sm-mta[1465905]: STARTTLS=client, error:
> connect failed=-1, reason=dh key too small, SSL_error=1, errno=0,

It seems your sendmail version is a bit old?  Check your favorite
search engine... you need to generate a larger DH key - how to do
that depends on your OS (or maybe update sendmail or disable DH?)