Coelacanthus

Without it, the program just fallback to UTC. /etc/localtime and $TZ are two ways to specify timezone for programs. The program look up the later first, if it’s empty and then use /etc/localtime. In theory, $TZ has better performance because of the glibc will not look up the last modified time of /etc/localtime when every calling of localtime lookup.

IMAPSync is a great tool! It works perfect when migrate mails from one provider to another. In fact, some providers suggest users use this tool rather than implement migration feature by themselves. e.g. Migadu.