Newly installed Virtualmin server, email sending repeatedly prompts for password

On a freshly installed Virtualmin server strange behavior in terms of email sending. Everything looks perfect on port 465 and 587, but sending clients are repeatedly prompted for their password.

Upon examining the log, the following is releaved every time the user tries to connect:

...
Mar 11 08:09:41 hostname postfix/smtpd[2349317]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory
Mar 11 08:09:41 hostname postfix/smtpd[2349317]: warning: unknown[a.b.c.d]: SASL LOGIN authentication failed: generic failure
...

The problem is hard to troubleshoot but the fix is simple:

service saslauthd start

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