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Add setting to override local hostname for SMTP

Daniel Gerhardt requested to merge mail-localhost into master

Java automatically uses the local hostname for sending mails and uses it for EHLO and the Message-ID header's scope. When running in a containerized environment, the hostname of the container might be used internally only and will not be resolvable by target mail servers. This should not cause problems with mail sending but can make tracing in case of problems harder.

For Docker Compose, the hostname of the webserver is reused as localhost for SMTP.

Closes: #209 (closed)

Edited by Daniel Gerhardt

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