On Fri, Sep 25, 2026 at 03:59:48AM -0400, Philip Webb wrote:
Recently, I suddenly encountered "SASL authentication failed",
when trying to send an e-mail using Mutt 2.3.2 on Gentoo Linux ;
earlier that day, I had sent several e-mails successfully
& had made no changes in my hardware or software.
I have used Mutt without serious problems since c 1998 .

At the end of  .muttrc  I have

  set ssl_starttls=yes
  set ssl_force_tls=yes
  set smtp_url="smtp://<me@myispaddress>:25"

Double check the port number. This would typically be :587 when using STARTTLS. 25 is only used between SMTP servers for relaying email nowadays.

--
Kevin J. McCarthy
GPG Fingerprint: 8975 A9B3 3AA3 7910 385C  5308 ADEF 7684 8031 6BDA

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