dovecot from server:mail project

对于 openSUSE Tumbleweed，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/server:mail/openSUSE_Tumbleweed/server:mail.repo
zypper refresh
zypper install dovecot

对于 16.0，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/server:mail/16.0/server:mail.repo
zypper refresh
zypper install dovecot

对于 15.7，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/server:mail/15.7/server:mail.repo
zypper refresh
zypper install dovecot

对于 15.6，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/server:mail/15.6/server:mail.repo
zypper refresh
zypper install dovecot

对于 SLE 12 SP5，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/server:mail/SLE_12_SP5/server:mail.repo
zypper refresh
zypper install dovecot

对于 16.1，请以根用户 root 运行下面命令：

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