Thanks for the pointer. It seems that libsasl2-modules was missing. Since I followed the same procedure in all cases, I guess it is the result of a different image from a different VPS provider.

On 29/01/2017 19:17, Viktor Dukhovni wrote:
On Sun, Jan 29, 2017 at 06:35:46PM +0000, Martin Brampton wrote:

I have several servers, all configured to send mail by relaying through my
main mail server on port 587. SFAIK they are all configured the same, and
use TLS with plain text authentication. They all have identical sasl_passwd
and sasl_passwd.db files.

Do they all have the requisite SASL plugin modules?

All but one of them works. The one that doesn't logs the "No worthy mechs
found" message and SASL authentication failed message.

Most likely the SASL "plain" plugin is not installed.


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