I just verified and the PLAIN SO file is in the SASL library. Is the SMTP server 'smtp.fastmail.com'? I specified this in the .netrc file and -server switch for send. If this is correct, then I can't figure out what the problem might be.
I appreciate your time so far. On Wed, Oct 15, 2025, at 9:53 AM, Ken Hornstein wrote: > On Wed, Oct 15, 2025, at 10:32 AM, Marcin Cieslak wrote: >> On Tue, 14 Oct 2025, Diego wrote: >> >> > >> > I'm providing and I believe is included in the SASL Cyrus library that was >> > compiled with the package. >> >> This might not be true, PLAIN mechanism is probably turned off in your SASL >> Cyrus library, >> which can be enabled or disabled in the "configure" step. > > I was going to say that is unlikely, but you are correct; PLAIN is not listed > as a supported client SASL mechanism in the debug output. Which is > unfortunate; I think PLAIN is the most common mechanism by far! I was going > to say that sometimes the client SASL library can omit mechanisms when it > thinks the connection is insecure, but as far as I can tell that's not true. > > What OS are you on, client-wise? Some Linux systems put different SASL > mechanisms in different packages so it might just be a matter of installing > the correct package. > > --Ken
