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?)
