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set TTL to 600 to prepare mail server migration

Frederik Schwan requested to merge freswa/infrastructure:master into master

While migrating the mail server we might have to change DNS records. Since the current TTL is 86400 sec = 24 hours, which would break our mail setup for that amount of time if we wouldn't lower it, we want to change it to a way smaller value of 10 minutes first. We'll lower it again to the minimum of 60 seconds while migrating to achieve a minimal downtime.

Belongs to #92 (closed)

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