check_smtp Bug / How to send DATA by Commands?

Ferenc Wágner wferi at
Sun Nov 6 13:22:42 CET 2022

"Daniel Fischer" <Daniel.Fischer at> writes:

> we want to use check_smtp to check an email delivery for an internal
> SMTP server. Several commands and responses were specified for
> this. Unfortunately, a timeout occurs. After checking the source code
> (Git), a response is obviously expected for each command. When
> transferring DATA with several lines (required), the timeout occurs
> due to missing response till closing the data transfer with ".".
> Can this be fixed/worked around? Is there an alternative approach that
> could work around the problem?


I don't know about check_smtp, but we use check_mail_delivery [1] for
similar tasks with satisfaction.


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